Eastern Maine Shooting Supplies, Inc. EMSS1375 5/16-27 Thread .58 Caliber Phosphor Bronze Bristled Bore Brush That Will Not Damage The Bore. Bristles Are Twisted On For More Durability. You Can Purchase 1 Individual Brush or 10 Brushes. *Please Note That All Of The Brass & Aluminum Supplies Are Made On Site. Sometimes Machine Setup Is Involved If Our Inventory Is Low. This Might Lead To A Slight Delay In Shipping Time. If That Is The Case, I Will Always Email You And Let You Know In Case You Need To Cancel. Thank You For Your Understanding. Please Visit Our eBay Store For More Sizes And Choices