FEATURES:-Machined from 6061-T6 extruded aluminum-Matte black finish-For Winchester 70 Short Action-20 MOA-Center Spread: 3.259"*-Overall Length: 6.276"-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 receiverPRODUCT SPECIFICATIONS:Dimension 1.00 X 3.40 X 8.20Height 1.0000Width 3.4000Length 8.2000STYLE PICATINNYFINISH BLACK MATTEMATERIAL ALUM ALLOYTYPE OF RINGS NEEDED MIL-STD 1913 PICATINNYRINGS INCLUDED NOTHER FEATURES: MADE IN USA