Product Description Product Info for Alpha Tactical Shark Muzzle Brake w/Crush Washer Shark Muzzle Brake with Crush washer Specifications for Alpha Tactical Shark Muzzle Brake: Threads per Inch: 1/2x28 Included Accessories: Crush Washer Features of Alpha Tactical Shark Muzzle Brake: CNC machined out of high quality solid steel or stainless steel block Side and Top ported to reduce back pressure Black Oxide finish or High polish stainless steel finish 1/2-28 thread per inch Engraved on top and bottom heat treated steel 2 7/8" long Front diameter is 22mm Bore diameter is 6.72mm Included Accessories: Crush Washer