Aluminum 6061-T6 .500 .460 and 350 Legend X Frame Scope Mount Remove the rear sight and install this versatile style base, scope mount, in just minutes. This scope mount has two 8-32 Brass set screws to support the mount out in front of the attaching screws for rock solid stability. Fits all X frame revolvers. New redesigned oversize recoil lug prevents the scope mount from shifting even when shooting full-house, magnum loads. Accepts all Weaver-style and Picatinny rings and accessories. We HIGHLY recommend watching our Scope Ring Installation Instructions before mounting any scope ring on this mount. 4-1/2" long, available in Silver and Black finish, weighs 1.8 ounces. Mounting screws are supplied and are 6-48 thread Torque specification for 6-48 is 13 inch pounds and uses 3/32 Allen Wrench 8-32 Brass set screws are supplied and use 5/64 Allen Wrench they are just finger tightened All screws and threaded holes must be thoroughly degreases before applying thread locker. Thread locker must be used on all screws