Professional tungsten carbide burr for commercial or occasional use Suitable for use with an electric drill, router or die grinder tools with 1/4 shank Suitable for polishing, grinding, porting, shaping and burnish wooden surfaces Double diamond cut so a lot stronger than the cheaper model Tungsten carbide burrs for maximum strength and durability Suitable for grinding most steel types, glass, plastics, marble, granite and various other materials All of the burrs come with a 1/4 (6.25mm) Hex shank Total length of the burrs approx 40mm SET INCLUDES THE FOLLOWING • 2 x cylinder (head shapes) - 10mm and 12mm • 2 x round nose (head shapes) - 6mm and 10mm • 1 x ball ended (head shape) - 10mm • 2 x Tree head (head shape) - 10mm and 12mm Comes in an EVA foam tray for easy storage and transportation