Egw scope base s&w revolver picatinny rail FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-For Smith & Wesson Revolvers (K, L, N, & X frames)-0 MOA-Mounting Hardware: Hex head screws & wrench provided-Installation: EGW recommends 20 inch lbs. of torque & a drip of blue Loctite Other Features: Made in usa, fits k,l,n and x frames