D400 shell end mill bore cutters are manufactured from High Speed cobalt for excellent tool strength and performance, and resistance to wear. They are of a standard bore, suitable for use with standard shell mill holders, with a large diameter available up to 100 mm. D400 bore cutters are suitable for slitting and cutting in aluminium, stainless steels, cast iron and steels, and will give clean and accurate results, thanks to the bright finish which prevents workpiece material from sticking to the cutting edges of the tool.