3M Hookit Clean Sanding Low Profile Disc Pad 20353, Hook and Loop Attachment, 5" Diameter x 3/8" Thick, 5/16"-24 External Thread, 44 Holes, Red Clean sanding low profile disc pad Attach with 5 inches diameter Hookit(TM) clean sanding discs or Hookit(TM) D/F discs Use with random orbital sanders with 5/16 inch-24 internal threads Made with red foam 5/16"-24 thread size