Zaffiri Precision Thread Protectors are made from high quality Stainless Steel. Available with Titanium Nitride (TiN) Gold, Black Nitride, or Stainless finishes Specifications Threaded 1/2 x 28 muzzle Quality: 416R Stainless Steel Stress relieved and heat treated to RC 40-42 Finish Options: Stainless Steel, Black, Titanium Nitride TiN (Gold) Made in the USA