A Set of Lock Nut for Grinding Cups and Saw Blades 5/8-11 with 7/8" Rim Free 1-3 days expedited shipping by USPS Complete set of two lock nuts and a wrench for grinders and polishers 5/8-11 standard thread and 7/8" rim for 7/8" arbor Fit cups, saw blades, and polishers we sell Standard size for use as new or replacing lost lock nut