tungsten carbide drill bits;carbide drill bit including twist dirlls, center drills, drills with straight flute, 3-lip drills.. tungsten carbide drill bitsWe ... , cemented carbide drills including twist dirlls, center drills, drills with straight flute, 3-lip drills, Diameter: 1mm-30mm Coated: Tialn, tin ... . We accept the specification as your requirement. : tungsten carbide drill bits