Material: Heat Treated High Aluminum Process: Precision-CNC Machining Thread: Brake Caliber:.308 .45 ACP Brake Thread:5/8x24 TPI OR 1/2x28 Sleeve Thread: 13/16 x16 TPI Finish: Black Nitride Dimensions: The dimension of the brake is 2.38 in x 1.0in =2.5 oz The dimension of the sleeve is 2.30 in x 1.36 in=2.29 oz Weight: 4.79 oz