SPECS: .30-.32 caliber nylon bore brush, 3 packDURABLE: Nylon bristles withstand ammonia based solventsDESIGN: Each nylon bore brush core is constructed from a single piece of wire with a loop on the end to avoid damage to your boreCONVENIENT: Features standard 5-40 threadsVARIETY: Explore the entire Tipton Nylon Bore Brush line for pistols, rifles, and shotgunsGUARANTEED: This product is covered by a limited lifetime warranty provided by Tipton. Please contact Tipton customer service for assistance