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 .375 Calibers - Nylon Bristles (.410 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
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