The D5 Descender has been designed for use on 1/2" (12.7mm) rope. The D5 is compliant with NFPA G and 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 Karabniner. 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.
A unique feature of the D5 Work/Rescue Descender is that the handle rotates through 360 degrees and emits audible 'clicks' as an indicator to the user of positive engagement of the mechanism.
It is also easy to back-feed the rope through the D5 and therefore the D5 can be used for smooth ascending or for emergency hauling (when used as part of a 'Z-rig').
The D5 has a Working Load Limit of (500lbs) 240kg, making it suitable for two-man rescue situations, without the need for the creation of extra friction.