Accu-Tac Scope Rings 34mm High (Clears 56mm Lens) Black Finish HSR-340 The Accu-Tac Scope rings are Precision CNC machined to very tight tolerances on the height, center-line, and tube bed arch. For perfect alignment of the scope it utilizes a built in bubble level for perfect leveling of your rifle, and high strength hardware for durability. Materials 7075 Aluminum Alloy - Height (center of tube to base): 1.39” – 35.3mm - Height (bottom of tube base): .720” – 18.29mm - Color: Flat Black - Coating : Type 111 (MIL-SPEC) Hard Anodize - Weight: 6.1oz/ 175g/ .382lb - Note : Will Clear a 56 mm Objective Lens Diameter