The smoothest functioning QD lever on the market Superior clamping that will not damage or coin the rail surface Extremely smooth in operation with a multi-facetted adjustment nut to get the exact tension required by the operator Fully adjustable with no tools required, can be adjusted to fit rails not machined to mil-spec tolerances Precision machined for optimum return to zero performance and reliability Hard coat anodized 6061 aluminum for a lifetime of service Patented QD lever by Elite Defense 100% made in the U.SA. with MI Lifetime WarrantyQD30SMH Technical Specs (High 1.4 Offset)Works with scopes with up to a 56mm objectiveWeight: 8.7 ozOverall length: 5.875 in.Width of rings: .850 in.Distance between rings: 2.800 in.Offset from the first ring: 1.400 in.Distance - top of rail to center line of ring: 1.900 in.