Grinding Capacity: 1.5dia ~ 32dia mm(straight shank & taper shank)Double wheels. It only need to rotate the motor when want to grind the tool of different material. It can increase the safety & save the time for changing & repairing the grinding wheel. The kinds of grinding tool include: drills, step drills ,taps, lips of end mills, round bars, etc. Adopts precision 4" 6 pawl self - cantering chuck, clipping one time. It can grind the blade of drills and do the paring of drills abdomen. The angle of drills both sides and the length of the blade are the same after grinding . it can keep the center of drills without off center. And with the vice pawl of chuck, it can increase the capacity of clamping to 100mm.