Midwest Industries Optic Mount QD 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 - Hole spacing from center to center 1.800 - Overall length 2.30 - Weighs only 2.0 oz. - 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 Warranty