The 426 cut-off wheel is reinforced with fiberglass for increased durability. 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 metal. May also be used on other materials-including thin wood, plastics and ceramics. May also be used on other materials - including thin wood, plastics and ceramics.