The Flexipad Medium Density Pads are suitable for polishing and grinding, these will accept GRIPĀ® and hook and loop backed sanding discs. The super polyurethane backing pad is made from impact resistant synthetic nylon which is bonded to microcellular polyurethane and with internal thread to suit sanders and polishers. Excellent resistance to initial and continuing tearing, oil and ageing. Made in Great Britain.A super polyurethane backing pad with internal thread to suit sanders / Polishers It will accept hook and loop backed sanding discs. Diameter: 115 mm.Metal Centre threaded internally: M14 x 2.