RCBS Small Case Neck Brushes clean dirt and powder residue from inside necks and simultaneously lubricate for expansion. Small brush for 22 to 25 caliber. Clean dirt and powder residue from inside necks and simultaneously lubricate for expansion with the RCBS case neck brushes. The no-roll handle design accepts all three nylon bristle brushes: small brush for 22 to 25 caliber, medium brush for 270 to 30 caliber, and large brush for 35 to 45 caliber. Small brush for 22 to 25 caliber Medium brush for 270 to 30 caliber Large brush for 35 to 45 caliber