897/4 IMP R Impaktor holder with retaining ring and ring magnetProduct Description: Wera 897 4 IMP R Impaktor bit holder with retaining ring and ring magnet. This Impaktor holder with retaining ring and magnet is designed to meet the extreme requirements when working with impact screwdrivers. The combination of a double torsion zone in the Impaktor holder and a torsion zone in the Impaktor bit results in a TriTorsion system. The TriTorsion system is designed to absorb impact forces and thereby protects the bit