3M 20427 3" x 1/2" x 5/16" Thread Size Clean Sanding Disc Pad Kit
Dust extraction Hookit back up pad (Clean Sanding) constructed on foam material. 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