Includes 5 adaptors:
- 1/4-20 EXT X 5/16-24 EXT
- 1/4-20 INT X 5/16-24 EXT
- 1/4-28 EXT X 5/16-24 EXT
- 5/16-24 EXT X 5/16-24 EXT
- 5/16-24 EXT X 6mm-1.0 EXT
3M™ Hookit™ Sanding Disc Pad Kit contains a dust extraction Hookit™ back up pad, constructed on foam. The backup pad has a 5/16-24 INT thread.