Tapco Self Timing Muzzle Brake Black Nitride Steel 5/8"X24 Threads 30 Cal. Made with heat-treated 4140 steel for strength and durability. With a thread pitch of 5/8 x 24 this brake seamlessly integrates into a variety of rifles. Specifications for Tapco TAP22046 Self Timing Muzzle Brake Black Nitride Steel 5/8"x24 Threads 30 C: Manufacturer: Tapco Fabric/Material: Steel Tapco TAP22046 Self Timing Muzzle Brake Black Nitride Steel 5/8"x24 Threads 30