- 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
100% Cotton Mops are ultra absorbent. They hold and carry solvents, lubes and preservatives into your bore and chamber. Great for applying large quantities of modern copper solvents to fouled bores.