Mounted aluminium oxide grinding stones for sharpening, deburring, rust removal and sanding. For use on metals, alloys, ceramics, tiles, stone, glass, plastics, fibreglass and wood. Compatible with most rotary tools including Silverline, GMC and Dremel. Includes 2 x cylindrical and 1 x cone. 3.17mm mandrel. Max 28,000rpm. Mounted aluminium oxide grinding stones for sharpening, deburring, rust removal and sanding. For use on metals, alloys, ceramics, tiles, stone, glass, plastics, fibreglass and wood. Compatible with most rotary tools including Silverline, GMC and Dremel. Includes 2 x cylindrical and 1 x cone. 3.17mm mandrel. Max 28,000rpm.