The new Kootenay HX from SMC is the most advanced Knot Passing Pulley on the market. This is an entirely new and more compact design and lives up to its "HX" (High Performance) name as the lightest, strongest, most efficient and durable pulley of its kind available. Aluminum side plates are used in conjunction with a high-strength aluminum sheave. Sealed ball bearings provide optimal efficiency and help to reduce the performance-robbing resistance that is inherent in most multiple component systems. The primary carabiner hole accepts numerous rescue carabiners. Secondary carabiner holes are provided for use with tag or belay lines. Two quick-release pins may be used in order "lock off" the sheave when a high strength tie-off is required. Adding to its versatility, the Kootenay HX may also serve as an edge roller for rope protection.