Sailrite 604u Monster II Balance Wheel Kit includes: Cogged Balance Wheel, Timing Belt, Plastic Hand Crank Handle, Shoulder Bolt, Set Screws, and an Allen Wrench. The hand crank allows for sewing use when electricity is not available. Greatly Increases Slow Speed Power and Control Use on Ultrafeed LSZ-1 or LS-1 Sewing Machines and works with the standard clutch or the Posi-Pin system 7 lb. Solid Nickel-Plated Steel Balance Wheel Made Exclusively by Sailrite in the USA