Hawkins Precision in Thread Protector 5/8-24 Stainless Steel. They come in a multitude of sizes to fit your needs and feature a melonite coating. This adds durability and creates lowered friction on muzzle threads which resists galling. Package Contents: Hawkins Precision Thread Protector Hawkins Precision 199-1125: 1.125 in Thread Protector 5/8-24 Stainless Steel