This is a replacement hinge pin set screw for Ultrafeed^® LS and LSZ, Leatherwork^® and Stitch Master^® Sewing Machines. The Ultrafeed^® Sewing Machine is normally mounted in a carrying case or wooden base. These platforms include two pin hinges to allow the machine to be tipped back for easy access to the underside of the machine for servicing. Hinge Pin Set Screws lock the sewing machine onto the case/base pin hinges.