Tipton Rifle Nylon Bore Brush 30/32 Caliber, 10-pk These Nylon Bore Brushes clean while protecting the bore from abrasion. All brushes have 8 x 32 male threads except the 17 caliber which have 5 x 40 male threads. Features: - Fits: All .30 Calibers (308 to 311 Bores) - Nylon Bristles (.343 Diameter) Unaffected by Ammonia based solvents. - Galvanized Plated Wire Core with Looped End and Crimped Coupler. - Thread: Standard 8 / 32" Notes: - Will Not Fit Outers Cleaning Rods