Scope Mount with Level Bubble for 1" and 30mm scopes -SKU: 5020Works with both 30mm and 1 inch scopes, with removable insert included Heavy duty, single unit base, machined from aircraft grade aluminum alloy Built in standard Weaver style rails very handy fitting flashlights and lasers etc. Rear spirit bubble level, helps fine tune scope in perfect position Shock proof 2 slot picatinny on 3 faces of the scope ring. Center to picatinny mount height : 1. 4" Length : 4. 19" Ring size: 1" 30 mm (with insert included)