Wera Impaktor holder designed to absorb extreme impulse peaks. Special torsion effect due to double torsion spring. The retaining ring ensures optimal seating of the tool in the holder. The magnet provides additional secure holding of the bit and screw. The Impaktor stainless steel holder with retaining ring and magnet meets extreme dynamic requirements by deliberately avoiding mechanically vulnerable small components. Primarily used in industrial screw assembly, for example, with screw robots. Drive: Suitable for bits with a 1/4" external hex drive according to DIN ISO 1173-C 6.3. Drive: 1/4" hexagon, compatible with screw machines with a socket according to DIN ISO 1173-F 6.3.