Tanker style muzzle brake is made of all steel construction with a heat treated, erosion resistant Black oxide finish. It comes with a .308 5/8"x24 thread pitch. Reduces recoil and barrel whip. This brake is perfect for rifles threaded in 5/8x24 thread, and are commonly used for the following calibers: .308 Winchester, .243 Winchester, .300 WM, .30-06, .270 Winchester, .300 AAC (BLK), 6.5 Creedmoor