... 5) Coated or not coated polishing carbide drill (with straight shank)Diameter: 1mm-30mm Coated: Tialn, tin (option)casting ... step drill, twist dirlls, center drills, drills with straight flute, suitable for high speed, lone time drilling and ... reamer, solid carbide saws, indexable insert, other tungsten carbide products. We accept the specification as your requirement. carbide drill (with straight shank ...