Dual action orbital sander pad super polyurethane replacement backing pads for random orbital sanders medium density standard profile with ultra tough fibreglass back plate max rpm10000 standard profile grip fastening back plate offers excellent dust extraction with self stick made in great britain abrasive diameter 150mm surface diameter 148mm holes 8 holes e120 9 holes thread 516 unf 8mm foam layer 12mm density medium max rpm 10000