Egw scope base savage round back sa picatinny rail 20moa FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-Will work with any short action round back Savage rifle with an ejection port-20 MOA-Center Spread: 3.930"*-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, this savage base will work with any short action round back savage with an ejection port