... " - 4" (12mm-100mm) D.O.P 1",2",or 3" (30, 50, 75, or 100mm) weldon ... S, cobalt steel. TiAIN coating availableideal for drilling structural steel and metalspecial designed double-action tooth ... .Apply to Nitto, Alfra, BDS, Ruko, drilling rig and other magnetic drill machine.Also applies to ... all types of vertical drilling machine, radial drilling machine, milling machine, lathe, etc.We ...