This 9, 10 & 15mm Dia Rotary Tool Grinding Stone Set 3PCE 282582 is an ideal addition to anyone's tools, whether it be for the garden, garage or DIY. These mounted aluminium oxide grinding stones are suitable for sharpening, deburring, rust removal, and sanding. They can be used on metals, alloys, ceramics, tiles, stone, glass, plastics, fibreglass, and wood. The set is compatible with most rotary tools, including Silverline, GMC, and Dremel. It includes 2 cylindrical stones and 1 cone stone, each with a 3.17mm mandrel and a maximum speed of 28,000rpm.