this black polymer universal fitting throw lever is a lightweight and very useful accessory for any size variable power scope. Ideal for long range competitive shooters and hunting. It simply clamps around the power adjustment ring and enables quick and easy adjustment of the scope's power magnification with just a light push or pull of the lever while maintaining natural hand, arm, eye and firing position. So simple to fit; slide around the power ring, tighten the textured threaded handle and cut off excess cable. Loosen the textured threaded handle and it can be removed and attached to another scope.