Diameter 8″ Large, soft Stikit back-up pad for sanding on metal with coarse grade abrasives. Durable, soft density foam and 45� tapered edge yield to curves and contours for uniform coverage and longer life. 3M Stikit system provides excellent adhesion and easy disc changes. High grade 1? foam reduces vibration from the tool for greater comfort and improved results. 5/8-11 interior threads fit low-speed polishers and grinders for versatility. Center hole thread size: 5/8-11 INT.