- With Weldon shank 19 mm - Internal bore : ø 14 - 17 mm = 6.35 mm ø 18 - 50 mm = 8.0 mm - Ground section : high performance toothing with pre-, middle- and post cutter - For highest requirements in capacity and tool life - these tools can also be used on all Magnet Drilling Machines with Weldon arbor. Suitable for : ALFRA-Rotabest (Weldon), ALFRA-RotaQuick quick change system, BDS, Bux, Ruko, Magnetor, Euroboor, Universal, Nitto, Jancy, Hougen, Magtron, Promac, Rotabroach and as well as for all types of magnetic drilling machines with Weldon shank.