These Dremel accessories (442) are durable carbon steel brushes designed for cleaning and removing rust of metal materials leaving a matte finish Versatile brush for removing rust and corrosion, polish metal surfaces, deburr and blend surface junctures or clean electrical components Carbon steel brushs are ideal to use on a variety of materials including steel, aluminium, brass, silver, gold and other metals Working diameter 13 mm; shank diameter 3.2 mm; recommended maximum speed 15,000 RPM Fits with all Dremel Multi-/Rotary tools or other 3,2mm shank size multi- / rotary tools