... tipped good performance in chip removal and friction resistance weldon shank/one 19.05mm 3/4" D.O.C 30,50 ... ,100mm Carbide tippedD.O.C 30,50,75,100mmweldon shank/one-touch shank 19.05mm 3/4",1 1/4"good performance ... other magnetic drill machine.Also applies to all types of vertical drilling machine, radial drilling machine, milling machine, lathe, etc. TCT Annular Cutter