PRODUCT FEATURES 30mm Diameter, High Profile 31mm 1.2 Inch from Base to Ring Center, 4 Screws per Ring, CNC Made SCTM-08 30mm High Profile Weaver Rings SCTM-22 30mm Medium Profile Weaver Rings SCTM-27 30mm Low Profile Weaver Rings SCTM-65 30mm Extreme High Profile Weaver Rings SCTM-37 25.4mm 1" Medium Profile Weaver Rings SCTM-56 25.4mm 1" High Profile Weaver Rings SCTM-64 25.4mm 1" Extreme High Profile Weaver Rings SPECIFICATIONS Ring Length: 16mm (0.63in) Ring Dia.: 30mm Height: 31mm 1.2in (from base to ring center) Weight: 125g (4.4oz) Material: 6061-T6 aluminum alloy Finish: Black matte Easy and quick installation Fit on 21mm picatinny and weaver rail Designed for real firearms With 1 pc T15 torx wrench