Stanley racing 5/8″ to 7/8″ nut splitter 79-044. he Stanley Racing nut splitter 79-044 is built to split nuts ranging from 5/8″ (15.8 mm) to 7/8″ (22.2 mm). Place the nut splitter on the target nut. The tool ensures the bolt remains intact while applying force to remove the nut effectively.