Egw scope base win 70 wsm picatinny rail FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-For Winchester 70 WSM-0 MOA-Center Spread: 3.514"*-Overall Length: 6.670"-Mounting Hardware: Hex head screws & wrench provided-Installation: EGW recommends 20 inch lbs. of torque & a drip of blue Loctite*The center spread is the distance between the two middle holes, center to center, on your receiver Other Features: Made in usa