High speed steel cutter for cutting and grout removal. For use on ceramics, tiles, stone, glass, plastics, fibreglass and wood. Compatible with most rotary tools including Silverline, GMC and Dremel. Working length 25mm. Mandrel 3.17mm. Max 28,000rpm. High speed steel cutter for cutting and grout removal. For use on ceramics, tiles, stone, glass, plastics, fibreglass and wood. Compatible with most rotary tools including Silverline, GMC and Dremel. Working length 25mm. Mandrel 3.17mm. Max 28,000rpm.