3M™ Hookit™ Clean 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, with five adapters for converting to: 1/4-20 external threads, 1/4-20 INT, 1/4-28 EXT, 5/16-24 EXT, or 6mm-1.0 EXT threads.

• Includes 5 adapters
• 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