Vortex Switchview Throw Lever SV-2 Made from lightweight, skeletonized hard-anodized aluminum Switchview easily attaches and detaches from the magnification ring Weight: 0.4 oz VIP Lifetime Warranty Compatible with select riflescope magnification rings with a diameter of 1.739 inches / 44 mm, Razor HD riflescopes with a rubber magnification ring, Viper HD models, Viper riflescopes with a metal magnification ring (PST Gen I, HST, HS LR, HS models), Strike Eagle Gen I 1-8x24 riflescopes, and Viper XBR crossbow scopes