... " - 4" (12mm-100mm) D.O.P 1",2",or 3" (30, 50, 75, or 100mm) weldon shank or one- ... 30,50,75,100mmweldon shank/one-touch shank 19.05mm 3/4",1 1/4" made of hardened H.S ... .S, cobalt steel. TiAIN coating availableideal for drilling structural steel and metalspecial designed double-action tooth cuts ... , etc.We also have Pilot Pin and MT Holders High Performance High-Speed Steel Annular Cutter