Set Details: 6 pieces stainless steel bore brushes; Diameters: 8mm, 10mm, 12mm, 15mm, 17mm, 19mm; Available in 6 different sizes of stainless steel wire brushes, each with a 4" length and a 1/4" hex handle for mounting on any drill or cutter (not included). Practical Design: The cleaning wire brushes are designed to easily reach narrow holes and tight areas for connections, pipes, bearings, cylinders or other tight cleaning requirements. Quality Materials: These bore brushes are made of stainless steel for strength and deep cleaning of rust and details; Twisted wire improves cleaning, it is durable and abrasive. Easy to use: You can simply stick one of the brushes to the included brush to drill through rust or dirt, it can also be used with any drill or cutter. Note: Do not exceed 600 RPM and do not rotate counterclockwise, just press and pull. Be sure to use these brushes correctly to extend their life. Product Features 1. Stainless steel brushes come in 6 different sizes: 8mm, 10mm,