Prevent unwanted and expensive damage to your rifle's muzzle threads and crown with easy-to-install thread protectors. Knurled exterior gives you a firm grasp to install or remove the protector in seconds. Available in popular thread sizes and diameters to match most commonly available rifle barrels. Mfg: Yankee Hill Machine Co., Inc. SPECS: Stainless steel, silver finish, except FAL, black finish. A 1/2 oz. (14g) wt.