... List:one set of main engine,a control box,a power cord,a set of jig(M12 M14 M16 M18(20) M22 ... to operate skillfully.b) Positioning numerical control is effected through laptop panel to set the speed, depth, positive &negative automatic control ... features of easy operation, light weight, high effciency, low work power, time and effort reduction, not easy to break screw which ...