3M(TM) Hookit(TM) II Low Profile Finishing Disc Pad 05245, Soft, 5 in x 11/16 in 5/16-24 External, 10 per case Designed for use with 5 inch Hookit(TM) II Discs. Pad is made with a soft density foam for better conformability and allows the disc to flex which gives longer abrasive life in loading applications. Use with grade 220 and finer discs. 5/16-24 EXT thread.