The Flexipad Medium Density Pads are suitable for polishing & grinding, these will accept VELCRO® Brand & 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. Made in Great Britain. Diameter. 150mm. Metal Centre threaded internally. M14 x 2.