... types of screw. 2 Power consumption is 60% of SAS series. 1,When you take the screw, you ... needn’t paying special attention to the position of the screw ... the screw will be pulled out.2,Energy saving, power consumption is 60% of SAS series, comprehensive ... modes, length, head types, tooth types of screw. ModelsFk-514Fk-517Fk-520Fk-523Fk-526Fk-530Fk- ...