This Vortex Switchview SV-4 Throw Lever maximizes the efficiency of magnification transitions with fluid precision. This throw lever is constructed of skeletonized, lightweight hard-anodized aluminum and attaches/detaches easily to the magnification ring. Compatible with select riflescope magnification rings with a diameter of 1.72". Available Spring 2015. Vortex Switchview SV-4 Throw Lever 1.72" SV-4