Blued muzzle breaks are made from hardened steel. When ordering specify thread (typically 1/2 x 28 or 5/8 x 24) and caliber. If you would like the break tapered to your barrel the include the dimension 7/8 from muzzle.
The Recoil Tamers Muzzle Break. 7/8″ Diameter BLUE
Made from hardened 7/8″ diameter 4140 steel, this size break offers excellent recoil reduction. Thread is 5/8×24. Please specify caliber.