Wera 05059490001 800/4 Z 1/4'' Hex Slotted Power Drive Bits are designed for slotted screws and are ducticle and tough for hard materials. Wera 800/4 Z 1/4'' Hex Slotted Power Drive Bits prevent premature breakage of the drive tip and are suitable for holders as per DIN ISO 1173-F 6.3.