ISC D4 Descender
The new D4 by ISC is a double stop device. It is designed to hold a static load of 4kN but to slip between 4-6kN so as to be able to be used as a fall-arrest/belay device. The D4 has a 16kN Minimum breaking strength, and is designed for loads up to 240kg (500 lbs)! Wear parts approach the point of indestructibility. Handle is made of aluminum (as opposed to plastic), and is extremely durable.
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