Stainless Steel Bore Brush - For severely leaded, fouled or rusted bores, the aggressive cleaning action of a stainless steel brush can help get them clean. The shank is one-piece, looped and wound (not two, twisted together and chopped off). Since darn near as many bore brushes get used in the shop as get sold, we've packed these custom-made, top quality brushes in bulk paks to make them more convenient and less expensive. Brownells Standard Line Stainless Steel Bore Brushes - 1 Dozen S/S.