Ball transfer unit are omnidirectional load-bearing spherical balls mounted inside a restraining fixture. 360 degrees universal transfer bearings is suitable for curved work created on band saws and router tables. 5/8 inch diameter ball bearing roller is perfect. With a load bearing capacity of 44 lbs each. Housing be made of carbon steel material, Roller Ball made from bearing steel. Widely used in transmission system, feeding system, processing system, processing machinery and packaging machinery auxiliary equipment.