Features SCACD-23 38mm 1.5in Bottom to Ring Center, Extremely Accurate w/ Full CNC Machined. Four Screws per Ring, 21mm Picatinny Mount with Two Crossing Bolts & Anti-Retreat Bar. With Air Bubble Level Indicating the Level Condition. SCACD-24 38mm 1.5in Bottom to Ring Center, Extremely Accurate w/ Full CNC Machined. Four Screws per Ring, 21mm Picatinny Mount with Two Crossing Bolts & Anti-Retreat Bar. Angle Indicator and Scope Level Help You Shoot with Precision at Long Range. SCACD-25 38mm 1.5in Bottom to Ring Center, Extremely Accurate w/ Full CNC Machined. Four Screws per Ring, 11mm Dovetail Mount with Anti-Retreat Pin. Cantilever Dual Ring Scope Base Mount w/ Air Bubble Level, Helps You Shoot with Precision at Long Range. Specification SCACD-23 Ring Diameter: 30mm Overall Length: 138mm / 5.4in Overall Height: 40mm / 1.6in Mount Length: 120mm / 4.7in Ring Width: 45mm / 1.8in Central Height: 38mm / 1.5in, bottom to center Gap Length: 73mm / 2.9in Material: 6061-T6 aluminum alloy Weight: 152g / 5.36oz Mount: 1913 Picatinny Finish: Black matte Screws per ring: 4 High-durability aluminum alloy in black matte Do not use over 18 inch / pounds of torque on the scope rings&'; screws Suggest 25 inch / pounds (Can Accept Max 45 Inch / Pounds) torque force for big nuts when installing the mount on the picatinny rail Cantilever scope mount with anti cant device buble lever designed for hard and rigorous use. With T15 torx wrench and retail package, the T15 torx wrench can be used to fasten the clamp nuts. SCACD-24 Ring Diameter: 30mm Length: 140mm / 5.5in Height: 58mm / 2.2in Central Height: 38mm / 1.5in, bottom to center Material: 6061-T6 aluminum alloy Weight: 130g / 4.6oz Mount: 11mm Dovetail Finish: Black matte Screws per ring: 4 High-durability aluminum alloy in black matte Do not use over 18 inch / pounds of torque on the scope rings&'; screws Suggest 25 inch / pounds (Can Accept Max 45 Inch / Pounds) torque force for big nuts when installing the mount on the Dovetail rail. Cantilever scope mount with anti cant device buble lever designed for hard and rigorous use. With T15 torx wrench and retail package, the T15 torx wrench can be used to fasten the clamp nuts. SCACD-25 Ring Diameter: 30mm Length: 140mm / 5.5in Height: 58mm / 2.2in Central Height: 38mm / 1.5in, bottom to center Material: 6061-T6 aluminum alloy Weight: 130g / 4.6oz Mount: 11mm Dovetail Finish: Black matte Screws per ring: 4 High-durability aluminum alloy in black matte Do not use over 18 inch / pounds of torque on the scope rings&'; screws Suggest 25 inch / pounds (Can Accept Max 45 Inch / Pounds) torque force for big nuts when installing the mount on the Dovetail rail. Cantilever scope mount with anti cant device buble lever designed for hard and rigorous use. With T15 torx wrench and retail package, the T15 torx wrench can be used to fasten the clamp nuts