... .Widely used in various modes, length, head types, tooth types of screw. 2 Power consumption is 60% of ... paying special attention to the position of the screw head, just put the drill tip into the guide ... , then slide along, the screw will be pulled out.2,Energy saving, power ... Widely used in various modes, length, head types, tooth types of screw. ModelsFk-514Fk-517Fk-520Fk-523Fk-526Fk- ...