Egw scope base rem 1100 picatinny rail FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-For Remington 1100/11-87-Center Spread: 1.48"*-Overall Length: 5.488"-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