897/4 IMP Impaktor holder with retaining ring and magnet, 1/4", x 75 mmWera Impaktor holder for the absorption of impulse peaks. Particular torsion effect thanks to the double-torsion spring. The retaining ring ensures an optimum fit of the tool in the holder. The magnet provides for additional fixing of the bit and screw. The Impaktor stainless holder