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. Also I f you would like the break tapered to your barrel include the muzzle dimension measured 7/8 from muzzle.
Recoil Tamers Muzzle Break. 1 1/8″ Diameter Stainless Steel
Made from 303 stainless steel, this large size break offers maximum recoil reduction. Thread is 5/8×24, Please specify caliber.