The FoldDown Switchview lever from MGM switches is a great example of how a rifle Rifle Scope accessory can improve the quality of your firearm in a manner that is truly beneficial to you. Through a series of rigorous engineering and testing, the MGM Switchview lever provides unique and valuable functionality to rifles that no other lever on the market can match. This rifle scope accessory is so reliable because it has been tried and tested by countless shooters, and it has stood the test of time - it is patented worldwide and used in military forces around the world. The MGM Switchview lever works with virtually any Rifle Scope magnification ring and is arguably one of the most popular Rifle Scope accessories of all time. The MGM Switchview lever has been tested with millions of rounds fired through different Rifle Scopes, and it has been used with hundreds of thousands of shooters in such a wide variety of weapon systems over the world. Since it is an integral part of the Rifle Scope adjustment mechanism, the force applied to the Rifle Scope will modify the internal workings of the rifle scope to the desired setting. By using the included Allen wrench, screw, and instructions, the shooter can make all the necessary adjustments to the Rifle Scope without using a third hand. The MGM Switchview Fold Down Scope Adjustment Lever works best with a rifle scope that has a 1x or a telescopic power adjustment ring. With the right reticle and reticle position, the FoldDown Switchview lever will give the shooter the desired adjustment range for that specific scope. Specifications for Switchview Folding Magnification Adjustment Throw Lever: Manufacturer: Switchview Color: Flat Black Fit: Magnification rings between 1.64in and 1.67in outside diameter w/ no indexing bump Finish: Anodized Condition: New Features of Switchview Folding Magnification Adjustment Throw Lever: Fits: BUSHNELL ELITE 4200 model scopes with illuminated reticle. GRSC 1x6 CRS model scopes Leupold VX-6 Mueller APT model scopes NIKON M223 (To be sure of the model/generation of Nikon scope you have measure the magnification ring diameter The Switchview you may need is the 1740SV2N3V1) Weaver Classic Extreme 1.5x4.5x24 model scopes Zeiss Conquest model scopes Other scopes with similar dimensions 1613-1655SVFD2 Flat black anodized Fold Down Switchview lever that fits scope magnification rings between 1.613" and 1.655" outside diameter with small indexing bump 164-167SVFD2 Flat black anodized Fold Down Switchview lever that fits scope magnification rings between 1.64" and 1.67" outside diameter with no indexing bump 167-171SVFD2 Flat black anodized Fold Down Switchview lever that fits scope magnification rings between 1.67" and 1.71" outside diameter with no indexing bump 172-176SVFD2 Flat black anodized Fold Down Switchview lever that fits scope magnification rings between 1.72" and 1.76" outside diameter with no indexing bump. Package Contents: Switchview Folding Magnification Adjustment Throw Lever Allen wrench Screw Instructions