Our HSS basic core drills are made of high performance high-speed steel and equipped with a Weldon shank, two driving surfaces and high performance toothing. The Alfra HSS-Basic core drills do not only fit Rotabest devices, but also machines from BDS, Bux, Ruko, Magnetor, Euroboor, Universal, Nitto, Jancy, Hougen, Magtron, Promac, Rotabroach and all other drills with Weldon shank.