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SKF Ball Transfers Bolt fixing units offer adjustable height, drilled hole fixing, optional extras, additional nuts, alternative thread sizes, and dirt exit hole. Bolt fixing units are ideal for transfer table at critical assembly line operations. The 4004 unit can be dismantled for cleaning. The units are offered in ball size range .75 to 2.00 inch (19mm-50.8mm). Loading 22,00 to 749 Ibs. (9.98 to 340kg).