The Vortex Viper PST GEN II Switchview Throw Lever improves the efficiency of magnification transitions. Skeletonized, rock solid lever lets you move quickly through the magnification range with just the flick of your wrist. With its split-ring construction, the Vortex Viper PST GEN II Switchview Throw Lever is easy to install and remove. Compatible with all ViperA(R) PST(TM) GEN II riflescopes Hard coat anodized aluminum Easy to operate on the run The Vortex Viper PST GEN II Switchview Throw Lever is a highly useful accessory, plus with its lightweight, low-profile design, you'll hardly know it's there - until you need it. Mfg: Vortex Optics