SV-3 SWITCHVIEW THROW LEVER Maximize the efficiency of magnification transitions with fluid precision using Vortex's SV-3 Switchview Throw Lever. The Switchview attaches and detaches easily to the magnification ring. Constructed of skeletonized, lightweight hard-anodized aluminum, the SV-3 is one tough accessory that will serve you well. Compatible with select riflescope magnification rings with a diameter of 1.930 inches / 49 mm: Razor HD Gen II riflescopes with metal magnification rings