The Midwest Industries QD High Scope Mount provides the smoothest functioning QD lever on the market and features a superior clamping system that will not damage or coin the rail surface. The QD Scope Mount is precision machined for optimum return-to-zero performance and reliability.FeaturesThe smoothest-functioning QD lever on the marketSuperior clamping that will not damage or coin the rail surfaceExtremely smooth operationMulti-faceted adjustment nut to get the exact tension required by the operatorFully adjustable with no tools requiredCan be adjusted to fit rails not machined to Mil-Spec tolerancesPrecision machined for optimum return-to-zero performance and reliabilityHard Coat Anodized 6061 Aluminum for a lifetime of serviceLifetime warranty2.8" between rings1.93" top of rail to center line of ring