DAS FlexPlate replaces the standard Porter Cable polishing pad allowing pads to be changed quickly and easily. The DAS FlexPlate requires only 0.15 pounds per square inch of pad pressure to begin flexing, offer better comfort (less hopping) and impoved polishing safety. When used with 6? to 7? foam pads, the DAS FlexPlate is perfectly balanced for use with the standard Porter Cable 7424 and the Ultimate Detailing Machine. 5" flexible backing plate fits all polishers with a 5/16-24 spindle. Ultimate Detailing Machine