1" rings Medium profile Fits 3/8" dovetail 4 hex screws/ring secure the scope Vertical stop pin Special tape inside the rings keeps your scope tight without excessive clamp pressure! Quality scope mounts don't have to cost a fortune. These rings will securely hold your expensive optics, even if your scope is mounted on a magnum spring-piston air gun. The vertical scope stop pin helps hold everything in place and hinders shift often found in rings that have no pin. The wider cap on our Mantis scope rings has 4 screws, giving you added security for your optics. The tape on the bottom of the each ring is another way this mount will grip the scope tube.