1" rings Medium profile Fits 9.5mm to 11mm dovetail Adjustable for elevation and height Up to 45 MOA vertical adjustment 4 hex screws/ring cap secure your scope 2 hex screws secure each ring base 22mm-23.8mm from base of ring to bottom of scope tube 21mm long 3.95 oz. Sportsmatch mounts have an excellent reputation for quality and strength. The adjustable height feature is a nice feature not found on most airgun mounts.