Fits all polishers with a 5/16-24 spindle. This is the recommended backing plate for use with all 6" pads. The 6" DAS FlexPlate, which requires only 0.25 pounds per square inch of pad pressure to begin flexing, is the perfect match for all 6" foam pads. With its unique 30 degree beveled edge, fully-laminated Velcro backing, and advanced polyurethane foam construction, the DAS FlexPlate adds a new level of safety and quality. When used with 6? foam pads, the DAS FlexPlate is suitably balanced for use with the standard Porter Cable 7424 polisher. Ultimate Detailing Machine