The D5 Descender has been designed for use on 1/2" (12.7mm) rope. The D5 is EN12841:2006/C and is compliant with NFPA G and ANSI Z359.4:2013 and developed for the North American Fire & Rescue and Tower Climbing markets, which typically use 1/2" ropes.
The D5 is a double-stop device with an auto-lock function, which is activated whenever the operator releases the handle; and a panic-brake function, which is not overly sensitive in normal use. The D5 also has a double-locking safety mechanism.
In addition to the locking button, the side plates are designed such that the plates cannot be rotated open, whilst under load, due to the position of the carabiner. The D5 is easy to attach/detach from the rope, without having to detach from the harness, therefore eliminating the risk of accidental dropping of the device. The D5 features a progressive cam action, which offers precise control during low or high speeds.
The cam is made from high grade, solid Stainless Steel, for maximum durability, even in harsh environments, such as Geotech work.
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The engineers at ISC developed a new handle operated cam system specifically so that in a panic situation the Descender would actually stop the descent, (rather than just slow it down). The D2 Descender is the only MicroDescender in the world to offer this function.