In 1982, John E. Damarin, started Pro-Shot Products with the goal to make quality faster and easier firearm cleaning accessories. The company takes pride in the quality of their products. Designed for competition shooters to withstand frequent use. Like our bore brushes, the chamber brush is also made to last with a brass core and bronze bristles. .223/5.56 Diameter Chamber Brushes are spefically designed for military style rifles with a stainless steel skirt to aid in chamber cleaning. Specifications and Features:Manufacturer Number: 223CHBrass CoreBronze Bristles.223 - 5.56 DiameterStainless Steel Skirt#8/32 ThreadMade in the USA