The Rotozip WD1 1/4 inch window and door drywall cutting bit is to be used with a power tool to help cut window and door drywall. For faster window and door opening cuts in drywall. Also works in foam board. It features a silver-metallic color. This heavy duty zip bit cuts window and door openings in drywall and foam boardFits spiral saw SCS01Clean cuts every timeThe original spiral saw bit