Bit-Check 6 PZ Impaktor 1, 6 pieces 6x 855/4 IMP DC Impaktor bits: 4x PZ 2x50 mm, 2x PZ 3x50 mm6 Wera Impaktor bits tidily arranged in a minimum of space in a practical Bit-Check. The Impaktor technology offers an above-average service life even under extreme circumstances thanks to the best possible utilisation of the material properties and the optimised geometry. The bit tip is coated with tiny diamond particles, this reduces the risk of any slipping out of the screw head thanks to the enhanced frictional resistance.