Original Midwest Industries MI-QD34XDSM QD 34mm Extreme Duty Scope Professional Grade Quick Detach Optic Mount Three QD levers to handle extreme duty users such as .338 or .50 BMG Rifles Superior clamping that will not damage or coin the rail surface Extremely smooth operation with a multi-faceted 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 construction for a lifetime of service Patented QD lever by Elite Defense 100% made in the U.S.A., with MI Lifetime Warranty Technical Specifications: Works with scopes with up to a 56mm objective Overall length: 6.75 inches (17,145cm) Width of rings: .850 inches (2,159cm) Distance between rings: 2.800 inches (7,112cm) Offset f...