Wera 05057662001 855/4 IMP DC Impaktor 1/4'' Hex Pozidriv Power Drive Bit (5-Pack)s are high quality bits for Pozidriv screws. Wera 855/4 IMP DC Impaktor 1/4'' Hex Pozidriv ® Power Drive Bits are designed with Wera's Impaktor technology that offers an abover average service life even under extreme circumstances. Wera 855/4 IMP DC Impaktor 1/4'' Hex Pozidriv ® Power Drive Bits are diamond coated for a secure fit in the screw, creating enhanced friction resistance that prevents any slipping out of the screw head. Wera 855/4 IMP DC Impaktor 1/4'' Hex Pozidriv ® Power Drive Bits are particularly suitable for use with customary impact drivers and are suitable for holders as per DIN ISO 1173-F 6.3.