TruePower 10-9111 5/8" Roller Ball Transfer Bearings, Set of 6 360 Universal transfer bearings - load rating is 55 pounds Excel where shop materials are pushed and turned in all directions Rollers have 5/8 inch hardened Steel balls rotating on 1/8 inch internal bearings 19Mm high x 29Mm wide x 50Mm long(base mounting bracket) For use bearing side up only, not for use as castor wheels