HSS specially designed tooth geometry enables immediate centering, smooth cutting, long tooth life combine with an excellent cutting capacity. Suitable for all makes magnetic drilling machines. Used on the Magnet-Seat Drilling Machines and Press, Milling machine also available Best choice for annular drilling on steel plate materials and large workpieces Special multi-cut design help to remove chips and reduce cutting resistance. Much higher in cutting efficient and better cutting result than the traditional twist drills. Suitable for steel structure projects, railway-traffic, bridging, shipbuilding, aviation and spaceflight industry. TCT also available.