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. The shank is one-piece, looped and wound (not two, twisted together and chopped off). 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. However, the aggressive action accelerates wear, and regular use can shorten barrel life. SPECS: Bristles: Available in stainless steel. Shank: Steel, looped and wound. Overall Length: 3.27 (8.3cm) Threads: 10-32 male, for use Mfg: Brownells