1" rings Low profile Fits Weaver/Picatinny rail 4 screws per ring cap Quick lock Includes 3mm hex wrench Special tape inside the rings keeps your scope tight without excessive clamp pressure. Quickly attach/remove these rings from your gun...no tools required! Just twist the hand-tightened knob, and the ring is ready to come off (or go on). Buy a bunch of these, keep your scopes in rings and easily move them from one gun to another.