Robust bit check wera bit checks allow rapid overview of the available tools they are thinner than the thickest tool they contain so they can even be carried in a shirt pocket 1 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