Running less RPM can reduce workpiece temps and increase disc life Norton 66623340082 3 Bear-Tex Rapid Prep AO TS (Type II) Non-Woven Quick-Change Discs, Fine, 25 Long Lasting Self Sharpening Discs Surface Conditioning Quick Change Discs, 2" Red (Medium) Prep Pad - 25 Pack 742889950327 40 Grit Grinding Sanding Discs 3 Quick Change ROLLOC(25 Pack). Quick-change discs provide flexibility in grinding, deburring and blending. They are ideal for working in smaller areas Grinding Tips: Try Running Disc at a Slower RPM, faster is not always better. Quick Change Disc HEX-ON Abrasives Hexagon shaped Quick Change Disc creates a leading edge as the disc rotates to improve the performance (This Disc was designed to use standard Male TR style threaded round rubber backing pad 1/4 Holder )