Maximize the efficiency of magnification transitions with fluid precision using Vortex's Switchview Throw Lever. The Switchview attaches and detaches easily to the magnification ring. Constructed of skeletonized, lightweight hard-anodized aluminum, this is one tough accessory that will serve you well. Included in the Box 2mm Screw 2mm Hex Wrench Compatibility 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 Viper XBR crossbow scope Weight 0.4 oz Installation Guide Properly mount your riflescope and have the Switchview™ ring, lever screw, wrench, and some lubricant available. Find the center of travel on your riflescope’s magnification adjustment ring and place a small mark at this point as a reference for positioning (Step 6). Apply one drop of lubricant to the ball of the Switchview™ ring (Figure 1). Slide the Switchview™ ring apart — just far enough to get it over the eyepiece and/or around the illumination knob. Carefully insert the ball of the Switchview™ ring into the socket of the lever by gently working the lever onto the lubricated ball (Figure 2).Note: Precise tolerances ensure the ball and socket fit together very tight. Insert the 2mm Screw through the unthreaded hole in the lever and into the ring (Figure 3) and tighten only until snug and doesn’t slip when rotated. If you use a torque wrench, tighten to 2.2 inch-pounds. When properly installed, a gap will remain between the two parts at the screw connection.Caution: Do not over-tighten. Over-tightening may cause damage to the Switchview™ and/or riflescope. Test to ensure the Switchview™ lever is in the best position for you. To adjust, simply loosen the screw and reposition the lever to a more comfortable position. Then, retighten the screw and test the new position.Attention: Ensure firearm is completely unloaded before making any modification. Unload, check inside the chamber, and remove anyammunition from the area. INCLUDED: SV-2 Throw Lever, 42mm Screw, 42mm Hex Wrench