Switchview makes changing the power of your scope easy; simply clamp it around the zoom ring of variable power scope. The Switchview enables quick and easy adjustment of the scope's power setting with a simple push or pull of the lever. Made from 6061/T6 Aluminum and anodized Black for lightweight durability. Great for shooters that need to adjust the scope power ring on the fly or in extreme environments where adjustment is difficult, such as hunting while wearing gloves, cold or damp conditions. Proudly made in the USA! Fits include Burris M-TAC, All, Meopta Meostar, K-DOT w/ Longer Screws, Nikon M223 / Monarch 1-4, 2-8, Nikon M223 3-12, Monarch 5-20, Redfield Rampage, Vortex Razor HD 1-4x24, 5-20x50, Vortex Razor HD w/ rubber magnification ring, Vortex Vortex Viper w/ metal magnification ring, Includes: 1.739" SV172-176(PST, HS-T, HS LR, HS, Viper XBR crossbow scope) & Diamondback HP riflescope.