51351 Atrix ATI55MXL Nut Driver-5.5mmThis Katun 5. 5mm magnetic nut driver with a 230mm shaft has a powerful rare earth self adjusting sliding magnet. The unique self adjusting magnet grabs 5. 5mm hex screws used in copiers, printers, MFPs, and fax machines with different heights of heads which results in better hold and less drops than fixed magnet nut drivers. The steel shaft is hardened chrome vanadium with chrome plating, and the handle provides a non slip comfortable rubber grip. 5.