DMM

Up and Under in Cardiff, UK, offers an extensive range of DMM products, catering to climbing, mountaineering, caving and professional work needs, as well as providing kits for outdoor activity centers and youth groups. DMM, originally founded as Moorhouse Engineering in 1981, transitioned to larger premises in Llanberis in 1986 and marked 40 years of manufacturing in 2021. The company, which started with just four employees, now boasts a workforce of over 200. Central to DMM's mission has always been to produce top-quality equipment at the best price, a commitment that has driven continuous innovation and growth in both recreational and industrial markets.
DMM’s success is rooted in its dedication to innovation, consistently investing in factory infrastructure, advanced machinery and product development to remain a leader in the industry. This approach has positioned DMM as a global frontrunner, backed by a skilled and loyal workforce. Recent expansions, including a purpose-built assembly area and CNC machining section, exemplify their commitment to efficiency and competitiveness. As the only UK manufacturer of climbing hardware, DMM continues to strengthen its unique market position, ensuring a robust future for both its recreational and industrial product lines.
DMM Revolver
The DMM Revolver is certified for use as both a karabiner and a pulley. It is the same as DMM's standard Revolver karabiner, but it features a locking gate which provides extra security. There is a small wheel in the rope location groove to reduce rope drag, allowing the rope to run more efficiently through the karabiner. The Revolver is also highly useful for creating lightweight hauling systems. If you need to haul kit, a partner, or perform crevasse rescue, the pulley wheel increases the efficiency and converting more of your energy into movement.
DMM Phantom HMS
The DMM Phantom HMS is an ultra-compact and lightweight belay karabiner that doesn’t compromise on strength. With a true HMS shape, it’s perfect for belaying with an Italian hitch or managing multiple clove hitches. Its extra-short gate and slim nose maximise internal space and make clipping to slings and textiles easy. Rope-friendly and available with Screwgate, Kwiklock, or Locksafe options, the Phantom HMS is a versatile essential for climbers and riggers.
DMM Phantom
The DMM Phantom is their ultimate trad and alpine screwgate Karabiner, and when you hold those 42 grams you will understand why! They claim they could have made it even lighter, but didn't want to compromise the handling or strength. As you can see from the specification below the strength is still impressive and the gate opening reasonable for a small D shaped karabiner.
DMM PerfectO Straight Gate
The DMM PerfectO Straight Gate is a true oval, compact karabiner that maintains the ease of use (even one-handed). Its shape provides effective centring of loads and the fully rounded rope bearing areas increase carabiner and rope longevity.
DMM PerfectO
The DMM PerfectO is a compact true oval connector that minimises the eye-to-eye length whilst maintaining usability and easy one-handed use. Their shape provides effective centring of loads and the fully rounded rope bearing areas increase carabiner and rope longevity.
DMM 30kN Boa HMS Keylock
The DMM 30kN Boa HMS Keylock is the heavier duty version of the 25kN Boa, it is hot forged from 14mm bar which gives it the 30kN major axis rescue that's required for rescue loads. Its ergonomics ensure that it is still easily operated whilst wearing gloves and the curved basket copes with even the busiest rigging set ups, allowing devices to settle comfortably.
DMM Spectre
The DMM Spectre is an all-round carabiner for versatility and can be used across trad, sport, or winter climbing. They are full sized for ease of handling, while I-Beam construction and wire gates keep weight low. If you want one type of carabiner to cover all your climbing needs, you need an all-rounder. Wire gates are the lightest gate type available, and resist freezing shut in cold conditions. They are crucial in reducing the weight of your rack, and are ideal for trad, winter, and alpine climbing.
DMM Zodiac 12mm Keylock
The Zodiac 12mm Keylock is DMM's flagship rigging karabiner. It's extremely strong and therefore suited to heavy use situations like heavy duty rigging, rescue loads and group instruction, where toughness and strength are key. The clean nose gate uses DMM's patented Taperlock design and their toughest barrel to give very strong gate open and side face strengths.
DMM Captive Eye
The DMM Captive Eye ensures that in real life situations the connector will never be cross loaded through misalignment. Whatever the captive eye is stitched or connected to it can move freely thanks to the circular hole. The hole can also accommodate a second connector should the need for a rescue point arise.
DMM 12mm Offset D
The DMM 12mm Offset D is a locking steel karabiner that is ideal for use in commercial environments, such as work positioning or in outdoor adventure parks and education centres. An Offset D connector takes the spinal loading strength of a D-shaped back but extends the basket at one end to maximize gate opening and overall size without compromising ergonomics and weight. Cold forged from 12mm bar, the strengths achieved in testing exceed 45kN and it is first choice in applications requiring stronger connectors in their systems.
DMM 12mm Klettersteig
The DMM 12mm Klettersteig is a steel carabiner that offers high levels of strength whilst combining a large gate opening so its easy to clip on steel cables for use on a Via Ferrata. The Klettersteig shape takes the strength and volume increases of an Offset D and then extends them even further to give a high volume, super-strong connector. The Klettersteig’s wide gate opening makes it particularly suitable for clipping oversized items, or simply allows ease of use in more normal situations.
DMM 12mm Boa HMS
The DMM 12mm Boa is a great steel carabiner with a wide variety of applications. Whether using in a commercial work environment, outdoor adventure parks or outdoor education centres - this is a steel karabiner capable of many jobs. It has all the versatility of its alloy sibling, but has a rated strength of 40kN. It can be used for many applications where a large gate opening or high internal volume are required. The smooth rounded internal form is very useful when rotating the karabiner through attachment eyes, and the basket curves nicely to allow central hanging of loaded components.
DMM 10mm Oval
The DMM 10mm Oval karabiner is a strong, compact steel connector designed for pulley systems, rope access, and fall arrest setups. Its oval shape ensures centralised loading, smooth pulley operation, and symmetrical performance, making it versatile and efficient in complex rigging systems. Available with Screwgate, Kwiklock, or Locksafe locking options, it combines strength, security, and ease of use. Cold-forged, heat-treated, and zinc plated, the 10mm Oval has been built to withstand demanding use while providing reliability and confidence in the field.
DMM 10mm Equal D
The DMM 10mm Equal D karabiner is a strong, compact connector designed for height safety, belaying, and anchoring. Its D-shaped design directs the load along the spine for maximum strength, while the cold-forged, heat-treated steel construction ensures long-lasting durability. Available in Screwgate, Kwiklock, or Locksafe versions, all zinc plated for corrosion resistance, it features a generous 15mm gate opening for easy attachment. Individually serial-numbered for traceability, the Equal D is a versatile, reliable choice for demanding environments.
DMM Rhino
The DMM Rhino karabiner is not restricted to assisted locking belay devices: it works brilliantly with standard devices. The full cross section of the top bar means greater wear resistance, and smooth operation in guide mode usage. The horn makes identification by feel on the rear gear loop easier, and the clean nose design provides snag-free loading and unloading of ropes. The big burly top bar is contrasted by our signature I-Beam construction on the non-rope bearing surfaces resulting in a total weight of 72g.
DMM Ceros
The DMM Ceros is a purpose-built belay karabiner designed to reduce the risk of cross-loading and improve rope handling. Its internal wire gate keeps the karabiner captive on the belay loop, while the horn on the spine prevents assisted braking devices from moving out of position. Lightweight yet incredibly strong, the Ceros features I-Beam construction, a full section top bar, and a snag-free keylock nose. Available in Screwgate, Kwiklock, Locksafe, Durolock, and ANSI-certified options, it’s the ultimate belay connector for climbers who prioritise safety and reliability.
DMM Anchor Rings
The DMM Anchor Rings are simple, functional anchor components that work seamlessly with connectors and textile components. They are ideal when a tamper-proof linking component is preferred over opening connectors, such as establishing remote anchor points.
DMM Zodiac 12mm Keylock with Captive Bar
The DMM Zodiac Karabiners are offset D connectors with an incredibly strong 32kN major axis, making them ideal for rescue loads and heavy rigging. The clean nose gate uses DMM's patented Taperlock design and their toughest barrel, giving very strong gate open and side face strengths. Can be used for general use where weight saving and high strength are important.
DMM K-Pro Rope Protector
The DMM K-Pro Rope Protector is a great addition to your stash of gear to prolong and protect ropes over abrasive or sharp edges.
DMM Bat Rigging Plate
The DMM Bat Rigging Plates are light, strong and versatile thanks to precision machining and heat treated alloy material. Height loss is minimised by the use of the Bat shape for complex rigging situations. With an oversized centre hole the plate is easily centralised when connected.
DMM Nylon 16mm Open Sling ID
The DMM nylon slings are wider and heavier than Dynatec for the same strength rating. However, it is a good all-round material that withstands repeated flexing better than Dynatec, has greater shock absorbsion, is less expensive and has a higher melting point. This makes nylon slings appropriate for heavy use or where weight isn't a prime consideration.
DMM Halfnut
The DMM Halfnuts excel in shallow placements, pin scars and situations where every gram counts. If they look familiar it’s because they have the same tapered faces and side profile as DMM’s tried and tested Wallnuts. The combined weight of the 1-11 Halfnut sets are 42% lighter than the equivalent Wallnuts and they are similarly colour coded.
DMM Shadow Quickdraw - 6 Pack
The DMM Shadow Quickdraw is a lightweight sport carabiner that gives easy clipping and stripping of routes thanks to its solid gates and keylock nose. A straight gate on the bolt end and bent gate on the rope end maximise ease of clipping, while the nylon sling gives you something to grab hold of when working routes. Ideal for onsight sport climbing.
DMM Spire Tech
The DMM Spire Tech is a modern, versatile and lightweight winter tool. The bent shaft and machined grips make it suitable for technical or sustained terrain when walking, mountaineering or ski touring. The refined design and rivetted construction result in a robust axe that weighs in at only 323g.
DMM Spire Axe
The DMM Spire Axe has been designed to handle the demands of modern winter mountaineering. It's tough, yet still light enough for general walking and ski touring use. The lightweight tubing has been optimised to strike a fine balance that carries without effort and can still penetrate ice and cut steps when required.
DMM XSRE Lock Captive Bar
The DMM XSRE Lock Captive Bar karabiners are now available with a locking screwgate and captive bar for added security! The removable threaded captive bar helps ensure the correct orientation with lanyards and holds components securely.
DMM Wallnut
Despite their simple appearance, the DMM Wallnuts are highly featured pieces of climbing hardware. Different alloy is used for each size - smaller Wallnuts are made from a harder alloy to prevent shearing, while larger sizes are softer so they can bite into placements. The larger Wallnuts also feature hollow construction to reduce weight.
DMM XSRE Lock
The DMM XSRE Lock karabiner is a highly functional and versatile accessory designed for both industrial and everyday use. Its compact oval shape, snag-free nose, and anti-vibration screwgate make it perfect for organizing gear, securing keys, or attaching pet leads. Crafted with a high-strength I-beam construction, this karabiner offers a strong yet lightweight design that's ideal for various applications, including working at height. Now with the added security of a screwgate locking version, the XSRE is a reliable tool for everyday tasks or more demanding jobs.
DMM Wallnut Set
The DMM Wallnut Set is the backbone of every trad pack and an essential in building a comprehensive rack. Complemented by other, more specialised pieces of protection, they are guaranteed to be the most regularly used piece of protection on your harness. Wallnuts are highly featured pieces of climbing hardware. Different alloy is used for each size - smaller Wallnuts are made from a harder alloy to prevent shearing, while larger sizes are softer so they can bite into placements. Larger Wallnuts feature hollow construction to reduce weight.
DMM Shadow Quickdraw
The DMM Shadow Quickdraw is a lightweight sport carabiner that gives easy clipping and stripping of routes thanks to its solid gates and keylock nose. A straight gate on the bolt end and bent gate on the rope end maximise ease of clipping, while the nylon sling gives you something to grab hold of when working routes. Ideal for on-sight sport climbing.
DMM Daisy Chains
The DMM Daisy Chains are 135cm Dynatec daisy chains for aid climbing progression. Full strength end to end, while the pockets are designed to hold body weight only, and should not be used to anchor directly to the belay.
DMM Revolver Rig Twin
The DMM Revolver Rig is a connector with an integrated pulley sheave. Featuring a high efficiency roller bearing sheave(s), a threaded removable captive bar and a full strength textile friendly basket.