Wera impaktor diamond hard bits for square screws wera 05057631001 wera impaktor no 2 x 25mm bit designed for use with square socket head screws impaktor technology ensures an above average service life even under extreme conditions thanks to utilisation of the material properties and optimally designed geometry particularly suitable for use with conventional impact drivers the rough diamond coating reduces the danger of any slipping out of the screw head wera 05057631001 impaktor diamon