.17, .22, .270/.284/7mm, .30, .32/8mm, .357/.38/9mm, .40/.41, .43/6mm, .44/.45, 20 Gauge, 410 Gauge
Nylon will not harm your barrel. Tightly wound precision brass core brushes effectively remove fouling from gun barrels.
Industry standard 8-32 male thread (5-40 for .17 Cal. & .204 Cal.)
5/16-27 male thread (12,20,28 & 410 Gauge)
Close tolerance specifications for perfect bore fit
Will not harm or scratch steel
Durable and reusable