Woodford Green Stainless muzzle breaks are made from 304 stainless 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 then include dimension measured 7/8 from muzzle.
The Recoil Tamers Muzzle Break. 7/8″ Diameter Stainless Steel