The 426 cut off wheel is reinforced with fiberglass for increased durability and used for cutting metal including hardened steel. Cut off wheels make it easy to cut bolts or screws or make slots in rusted or stripped bolts and screws for removal with a screwdriver. Ideal for cutting, grooving and trimming all kinds of metalMay also be used on other materials-including thin wood, plastics and ceramicsFits mandrel #402Cut bolts or screws or make slots in rusted or stripped bolts and screwsThe cut-off wheel cuts only along its edge