Makes surface preparation fast and easy. Great for removal of undercoatings, stone guards, seam sealers and rust. Open mesh disc made from a tough, abrasive impregnated material . Perfect alternative to wire brushes for tough clean-up jobs on almost any type surface. Discs are used with 3M wheel mandrel4" x 1/4"; 10 discs per bag. Works well under hood webs, in truck beds, door jambs, under carriage and wheel wells. Maximum operating speed: 6,000.