• Bronze bristles resist corrosion • Cleans without excessive abrasion • 8-32 standard threads • Sizes available for almost every caliber A clean firearm simply performs better, and there's no better way to keep your guns in pristine condition than with Remington cleaning accessories. The Rem Brush's bronze bristles resist corrosion and will clean your bore without excessive abrasion. 8-32 standard threads. Brushes available in almost every caliber.