Dormer?s D402 tools are roughing shell end mill bore cutters. They have a standard bore so can be used with standard shell end mill holders for slitting and cutting in aluminium, steels, stainless steels and cast iron. With a coarse pitch roughing profile, the tools are designed for high metal removal roughing applications. The bright finish prevents workpiece material from sticking to the cutting edges of the tool so you will get a clean, accurate result every time. The premium High Speed cobalt used in manufacture provides excellent tool strength, wear resistance and performance.