The core of the Nylon Bore Brush is a single piece of wire that is looped on the end and a crimped coupler, so it will not scratch your bore. The Nylon bristles are unaffected by Ammonia based solvents.
17-20 caliber is 5-40 threaded
22-50 caliber is 8-32 threaded
10-28 gauge & 410 Bore are 5/16-27 threaded
Will fit most brands of cleaning rods
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