3M Spindle Extender Kit, Spindle Extender Kit Item, For Use With: Use on flexible shafts with Scotch-Brite Wheels for better alignment and handling 6 or 8" diameter, up to 4" in width, Used to change the attachment style of a tool for use with common attachments used on accessories for abrasive disc, Includes: Two 3/8" Wire Spacers, Two 1" X 5/8" Flange Adapters, (1) 2" O.D. X 5/8" I.D. Washer, (1) Spanner Nut, (1) Spindle Extension, 6" Length, Thread Size: 5/8-11 External X 5/8-11 Internal