SW4 x 50mm Impaktor Impact Screwdriver Bit for Hex Socket Screws - 840/4 IMP DC SB SiS - 

Wera 840/4 IMP DC Impaktor Diamond Coated Long Service Life bit, with Hex-Plus profile that prevents the rounding out of Hexagon socket screws, whilst allowing 20% more torque to be transferred. Wera's Impaktor bits maximise utilisation of material properties. Using a very special geometry, the bits are designed to meet extreme working demands via the unique TriTorsion system. TriTorsion is the combination of a double torsion zone in the Impaktor holder and also a torsion zone in the Impaktor bit. This system uses the torsion zones to absorb peak loads from modern impact drivers, protecting the drive tip and therefore dramatically extending the service Life of the bits. Impaktor bits also feature miniature Diamond particles, which bite into the screw head preventing cam-out and reducing the contact pressure required, greatly delaying user fatigue in power tool applications.