Underground Manufacturing 1-Hole SS Simple Replacement Spool Bolting & Aiding Optimized durability

Optimized durability

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and in cases evaluated according to current regulations and using the appropriate adapter

Brynje Super Thermo base layers have been used extensively in expedition work and are worn by Special Forces troops across the globe

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Underground Manufacturing 1-Hole SS Simple Replacement Spool Bolting & Aiding Optimized durabilityUnderground Manufacturing 1 Hole SS Simple Replacement Spool Stainless steel replacement spools pulleys for the venerable Petzl Simple descender. Made of 316 stainless steel, these replacement spools last approximately 6 10x as long as the stock 6061 Aluminum spools. They offer reduced friction and a much smoother ride. We recommend replacing only the bottom spool (which sees the most wear) with the stainless steel versionreplacing both is