... 4) ISO9001:2000 5) Coated or not coated polishing carbide drill (with straight shank)Diameter: 1mm-30mm Coated: Tialn, tin (option)casting ... , solid carbide drills, cemented carbide drills including step drill, twist dirlls, center drills, drills with straight flute, suitable for high speed, lone ... carbide products. We accept the specification as your requirement. carbide drill (with straight shank)