Dynabrade 56315 3-Inch by 4-1/4-Inch Hook-Face Short Nap 3/8-Inch Thick Medium Density for Reattachable Discs Non-Vacuum Dynabug II Disc Pad, Orange Pad mounts with four screws. High quality backup pad. Weight-mated for smooth running and minimal tool vibration Short nap pad for use with reattachable discs Short nap pad for use with reattachable discs Industrial-rated for tough production performance