PRISM Descender

Variable friction and high capacity rope access descender for abseiling, ascending, lowering, hauling and rescue.

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Multi functional PRISM descender device specifically designed for rope access. High capacity rope descender device can be used for abseiling, ascending, lowering, hauling and rescue.

Multiple threading configurations provide different levels of friction. User can switch from one configuration to the other while device is loaded:

Normal Friction – will brake if the handle is released or if it is squeezed fully. PRISM descender device does not require additional friction from a second karabiner to hold higher loads.

Reduced Friction – used for: ascending, paying rope in and out, or under partial load, such as when moving across a horizontal surface towards an edge prior to abseiling.

Meets selection criteria of IRATA International Code of Practice, March 2013,

Locks if handle is released or squeezed too hard. Suitable 2 person loads.

Patented duo brake mechanism increases friction under heavy loading and reduces rate at which friction is released.

Inspection and cleaning is simple as all component parts of device are visible and accessible.

Stainless steel friction surfaces for reduced wear and consistent performance.

Can be used as a releasable anchor in rig for rescue systems.

The PRISM descender device provides a hands free locking function and can be changed from lift to lower whilst under load. It is a core component in the Advanced Lifting and Lowering Kit.

Rope diameter: 10.5 mm – 11.5 mm

Patented GB 2 367 048

Commodity Code: 7616999099

Country of Origin: UK

Made in Britain Horizontal logo - Colour

D31 Prism NEW 1600x377


  • Multiple configuration, can change between configurations under load
  • High 200kg load rating, suitable for rescue
  • Double-braking mechanism
  • Robust, high strength aluminium with stainless steel friction surfaces
  • All component parts visible for easy inspection and maintenance


Sizing: Rope diameter 10.5mm - 11.5mm
Material: Aluminium and stainless steel
EN Mass Test: 200 kg
Loading: 200 kg SWL
Weight: 0.45 kg
Conformity: EN341 B, EN12841 C