The RSI Triple Sheave pulley is the only triple sheave pulley with rotating sideplates. It is specially designed for ropes up to 5/8″ diameter. It can also be reaved at any point on the line. 5:1 triple over double block and tackle system is achievable when the Triple Sheave is used in conjunction with double sheave pulley with becket. High strength alloy aluminum construction with Oilite bushing or sealed bearing makes for lightweight longevity. Triple carabiner rigging point. Sealed bearing optional. The Triple Sheave meets and exceeds NFPA/ANSI/OSHA specifications.