... various modes, length, head types, tooth types of screw. 2 Power consumption is 60% of SAS series. ... 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 ... various modes, length, head types, tooth types of screw. ModelsFk-514Fk-517Fk-520Fk-523Fk-526Fk-530Fk-540suitablescrenws( ...