VOTAW DISC SANDEROur #2391 Disc Sander is designed to trim and square up the ends of key hinges, hinge rods (long screws), slide pipes, brass tube, etc. Designed for fast setup, simply clamp bottom recessed area of chassis into standard bench vise and sander is ready to use. For hinge rods and tubing, use any of the four different sized 'V' slots located on the carriage top. To accommodate various key shapes, position one or both key saddles into the desired carriage