Specifications: Lightweight yet incredibly rugged. Tall enough to accommodate a scope with a 56mm objective with Butler Creek lens covers on a Remington 700 with a heavy contour barrel. The distance from top of rail to centerline of the 30mm scope ring is 1.140". Square cut cross bar and locking nut are manufactured from 4140 chrome moly steel for strength. The side bar is significantly thicker than most to permit high-torque tightening without the associated problem of sidebar flex. 4 steel cap screws attach the top of the ring to the ring base. Cap screws threaded into stainless steel "helicoil" inserts to prevent stripping the threads. Material: Precision CNC machined from 7075 billet aluminum. This is the same aluminum alloy used to manufacture Colt AR-15 and M16 receivers. Finish: Type III hard coat anodized in a non-reflective matte black finish per Mil-Spec. Weight: Set weighs only 4.8 oz. Warranty: Lifetime.