Maximize the efficiency of magnification transitions with fluid precision using our throw lever. Constructed of skeletonized, lightweight, tough, hard-coat anodized machined aluminum.CompatibilityCompatible with all configurations of Viper PST GEN II riflescopes.Compatible with all configurations of Razor HD AMG riflescopes.Compatible with select riflescope magnification rings with a diameter of 1.81 inches / 46 mm.