Perfect for getting into hard-to-reach places, the versatile 428 Carbon Steel Brush is ideal for removing rust and corrosion, polishing metal surfaces, deburring, blending surface junctures, or cleaning electrical components. Can be used on materials like brass, copper, or other soft metals such as tools, door knobs, automobile parts and electrical contacts. Featuring a 1/2 In. (12.7 mm) diameter the inverted cone shape of the brush is effective in cleaning flat surfaces and getting into hard-to-reach places Pack includes two carbon steel brush accessories.