Egw scope base browning a-bolt la picatinny rail FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-For Browning A-Bolt Long Action-0 MOA-Center Spread: 3.86"*-Overall Length: 7.064"-Height: 0.4"-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