Innovative Products Of America Professional Bore Brush Set is a 36 pc professional bore brush set that includes 8mm through 19mm steel, brass and nylon twisted wire bore brushes. This set features a convenient quarter inch hex shank for use with standard drivers and a twisted wire for increased cleaning function . The set is packaged in blow molded case with extra storage. It helps to clean the bolts, ports, holes, guides, tubes, miscellaneous parts, rims, bushings, slides and many more.