Dynabrade 56321 6-Inch Diameter Hook-Face 52 Holes 3/8-Inch Thick Urethane Medium Density 5/16-Inch-24 Male Thread Vacuum Disc Pad, Orange Exclusive single-piece hub design reduces pad vibration and ensures smooth performance Sanding Pad is perfectly weight-mated to Dynabrade tools, for achieving consistent swirl-free finishes Compatible with Mesh Abrasive material Dust-free sanding and elimination of pilling problems provide longer abrasive life and improved finish Helps eliminate "pilling" issues