Hawke Match Mount Rings 9-11 mm 1 in. Medium High grade aluminum construction;Internal cushion tape prevents marking and damage;Double hex screws hold your scope firmly in place;9-11mm models a fitted with a recoil stop pin;Reversible dove tail clamp fits9-11mm and 3/8" Item Category Code: 3300 Product Group Code: 3300C Product Sub Group 1: 3300C3 Inactive: No Prop65 Applies: No