expanding drill(3 flute) Diameter: 1mm-30mm Coated: Tialn, tin (option) With high quailty, ... and good price. We supply you various expanding drill(3 flute),solid carbide drills, cemented carbide drills including step drill, twist ... dirlls, center drills, drills with straight flute, suitable for high speed, lone time drilling and Dry Machining ...