Impactor bits 50mm long 1/4 drive set of 6. The Impaktor technology ensures an above-average service life even under extreme conditions thanks to a best-possible utilisation of the material properties and optimally designed geometry, particularly suitable for use with conventional impact drivers. Wera 6 Piece Diamond Screwdriver Bits Impactor bits 50mm long 1/4 drive set of 6. The Impaktor technology ensures an above-average service life even under extreme conditions thanks to a best-possible utilisation of the material properties and optimally designed geometry, particularly suitable for use with conventional impact drivers. The rough diamond coating of the bits reduces the danger of any slipping out of the screw head due to the enhanced frictional resistance. Set contains; 6 Bits 4 x PZ2 and 2 x PZ3.