Tipton Bore Gun Mop Brush (Pack of 3) Small Rifle Chamber Mops fit 22 Hornet, 222, 223, etc Large Rifle Chamber Mops fit 22-250, 308, 30-06, belted magnums, etc 17-20 caliber is 5-40 threaded 22-25 caliber is 8-32 threaded 10-28 gauge & 410 Bore are 5/16-27 threaded