Built to the 1913 Picatinny specification, Seekins Precision Scope Rings have a center lug machined directly into the bottom. This integral, flat recoil lug is far superior to cross bolt lug designs and fits precisely into Picatinny slots with minimal clearance. For maximum torque and strength, Grade 8 T-25 Torx fasteners are used that will not strip out while being tightened to the appropriate specification. It is constructed fro 7075-T6 billet aluminum with a hard coat anodized finish, 30mm tube diameter, and 1.45" high ring height. This model has a black finish and a 20 MOA.