The Flexipad Medium Density Pads are suitable for polishing & grinding these will accept velcro type hook & loop backed sanding discs. The super polyurethane backing pad is made from impact resistant synthetic nylon which is bonded to microcellular polyurethane & with internal thread to suit sanders & polishers. Excellent resistance to initial & continuing tearing oil & ageing. Size 178 mm. Thread M14 X 2 Max Rpm 4500.