Karebac 5115 Back-up Sanding Pad, Hook and Loop 5" by 5 Hole x 3/4" Thick, 5/16"-24 External Thread (1 Pack), Yellow 5" Diameter with 5 Holes 3/4" thick Hook & Loop back up pad 5/16"-24 Threaded Hub Provides a firm attachment, yet allow for easy removal of abrasive disc