Three types of brushes: stainless steel, brass, nylon; all with 1/4" quick chuck shanks for power tool use.Each type of brush available in 6 sizes: 9, 11, 13, 15, 17, 19mmSet includes a 150mm (6 inch) extension with quick chuck for power tool use.Soft grip handle for comfortable hand use. Supplied in a canvas fold up case.Replaceable Brush Sets available, please see Laser Part Nos. 1846 (nylon), 1847 (brass), 1848 (stainless steel). All in packs of 6 brushes.