Wera 05073990001 897 4 imp impaktor ringmagnet bit holder 75mm wera 05073990001 this impaktor bit holder from wera is suitable for use with power driven screwdrivers to cushion extreme impulse peaks it is equipped with a ring magnet which will easily hold longer and heavier screws even for overhead work wera 05073990001 897 4 imp impaktor ringmagnet bit holder 75mm