Shooters Choice bore brushes feature phosphor bronze bristles and an aluminum stem that work together to offer an effective clean without damaging your barrel. Each brush is stamped with the brush size on the stem to allow for easy identification. Shooters Choice brushes are outfitted with the standard 8-32 thread.Features : Cleans: .22 Rimfire, .22-250cal, .223cal/5.56mm Length: 3 Inch Thread: 8-32