One of the most frequently used components in any at height kit is the descent device, the D4 manufactured by ISC is made from durable steel and aluminum and meets ANSI Z359 specifications.
The revolutionary development among the rescue devices for professionals! The D4 Work/Rescue device is an innovative product destined to be used on ropes with 10.5-11.5 mm diameter. It allows controlled descent of two people with a total weight of up to 528 lbs. therefore, this device can be used for pick off rescues if needed. The lever allows a very precise control when descending, even with two persons. With an integrated double safety feature; the anti-panic function stops the descent if the user pulls too hard on control lever, the integrated lock position allows this device to be locked off when the user is at the desired height.