Easily transition between magnifications with this Vortex Switchview SV-2 Throw Lever made of skeletonized, lightweight anodized aluminium. Compatible with select riflescope magnification rings with a diameter of 1.739 inches / 44 mm: Razor HD riflescopes with a rubber magnification ringViper riflescopes with a metal magnification ring: » PST (Gen 1) models » HS-T models » HS LR models » HS modelsViper XBR crossbow scope Vortex Optics Vortex Switchview Throw Lever SV-2