High quality wire wheels specially encapsulated in a durable bonding material that holds the wire bristles stiff and straight. The bristles will not bend, flare or splinter. Removes paint, caulking, rust and sealers without “loading up” and will reach areas where grinding discs can not. Excellent for deep indentations, sharp contours and flanged lips. Can run at speeds from 15,000 to 20,000 rpm and will outlast most wire brushed on the market 40 to 1. Use with portable tools and drill press. Drive arbor has 1/4″ shrank.