Product Description 1/2 x 28 (for .223/5.56) or 5/8 x 24 (for .308, 300 blk, 7.62) Black finish 3.9 ounces CNC machined heat treated steel Timing washer included 2 3/8" long Reduces recoil and muzzle climb Front diameter is 25mm Listing is for one brake (+ washer)