Firm backing pad for use with hook and loop polishing sponges, bonnets and sanding discs. Compatible with angle grinders and sander polishers. M14 x 2 female thread. Max 12,500rpm. Firm backing pad for use with hook and loop polishing sponges, bonnets and sanding discs. Compatible with angle grinders and sander polishers. M14 x 2 female thread. Max 12,500rpm.