Wera 897/4 Impaktor Bit Holder with the unique TriTorsion system, which features one Torsion zone in the bit and two in the holder, these are activated according to the demands of the application. The unique bit holder also features a slim stainless body and strong retaining magnet to magnetise bits. Use with Impaktor bits. The Impaktor technology ensures an above-average service life. Specification: Size: 1/4in x 75mm