Euroboor Tungsten Carbide Tipped Annular cutters are equipped with a spiral flute which creates optimum chip removal and seizure is virtually impossible. Used on hardened materials such as HARDOX steel, stainless steels and high tensile strength such as railway tracks. Less susceptible to breakage than standard HSS cutters, especially in larger diameters and lengths. 3/4" Weldon Shank.