Knot Wire Cup Brushes - High Speed Small Grinder, 2-3/4" Dia. x 5/8"-11 ArborRemoval of weld scale, rust, old paint and corrosion Cleaning and surface prep of metals Use on portable power tools operating at high speeds, or where uniform cleaning is desired Designed for high productivity and long life Knot style offers aggressive action Available in crimped, knotted and heavy duty knotted styles Designed for 4 1 2" and 5" grinders Brush Diameter: 2 3 4" Fill Length: 7 8" Fill Diameter: 0. 014" Application Type: Stainless Steel