We are offering twist drill bit machine. For 2mm-13mm dg drill re-sharpening , angle 118°-140° for 2mm-13mm twist drill re-sharpening , angle 90°-140° precise grinding results , precision assurance within 0.02mm easy to operate , grinding a drill within 10 seconds. Special design high accuracy alloy steel collets accurate grinding consumption 0.2mm high efficiency dc motor stable quality ge diamond dust grinding wheel considerable design, invisible tool box, delicate & friendly use portable design with only weight 12.5 kgs.