The answer to quickly mounting your Piglet light to your rifle or shotgun barrel. This powerful but compact magnet with thumb screw locking ring mount installs in seconds. Simply loosen the screw and open the hinged ring to install your light. Coated magnets are strong enough to keep a small compact light source securely attached to your barrel. Makes for quick changes from gun to gun and withstand recoil. NOTE: For use with lights 3oz or lighter.