The wera 8755 9imp dc bit check pozi 9 piece set has an impaktor holder with retaining ring and ring magnet in the chuck for a secure fit of the bits in the holder and 9 impaktor bits 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 holder equipped with a ring magnet to easily hold longer and hea