Hawke 2pc 30mm 9-11mm High 1" Extension High profile to accommodate larger-objective scopes Double hex screws to hold scope in place Fitted with recoil stop pin Internal cushion tape prevents marking and damage High-grade aluminum anodized in matte black 2-piece configuration, one ring has1" extension Ring size (diameter): 30mm Rail: 9-11mm Double hex screw fixings for rail and top cap Height: 50mm (1.9") Weight: 113g (4 oz.) Rounded edges to prevent scope damage