1) Co:10-12% 2) Grain size 0.5-0.6um 3) DIN or ANSI standard . 4) ISO9001:2000 5)Coated or uncoated We supply carbide drills(powerful drill)solid carbide drills, cemented carbide drills including step drill, twist dirlls, center drills, drills with straight flute, 3-lip drills, Diameter: 1mm-30mm Coated: Tialn, tin (option) With high quailty, dilivery in time and good price. Attention: The price ...