2" Mongoose Pulley w/ back-up designed by Robertson Mountaineering is designed to provide a secure running belay for activity on wire rope. It features a case hardened steel sheave heat treated .030 deep to a rockwell C scale of 56-58. This temper is chosen to prevent the steel sheave from becomming brittle and causing where on the wheel and not on the main life support cable.

The axles and side body plates are 304 stainless steel. The sheave has an oilite bushing which gives exceptional performance in the outdoor environment. The scissor action makes for quick installation on cable up to 1/2". When used with the Stargate Spin Static the belayer is positioned 90 degrees to the cable for safety and control.