Vortex Optics Switchview Throw Levers Maximize the efficiency of magnification transitions with fluid precision using Vortex's SV-2 Switchview Throw Lever. Compatible with riflescope magnification rings with a diameter of 1.739 inches / 44 mm. Constructed of skeletonized, lightweight hard-anodized aluminum, the SV-2 is one tough accessory that will serve you well. The Switchview attaches and detaches easily to the magnification ring. Compatible with Razor HD riflescopes with a rubber magnification ring, Viper riflescopes with a metal magnification ring (HS-T, HS LR, HS models),Viper XBR crossbow scope, and Strike Eagle 1-8x24 riflescope.