Wera 05052490001 887 4 rr rapidaptor universal bit holder with ring magnet wera 05052490001 the rapidaptor universal bit holder from wera enables bits to be changed quickly and easily and has a ring magnet and stop sleeve for secure screwdriving on the holder suitable for use with 1 4in hexagon insert bits wera 05052490001 887 4 rr rapidaptor universal bit holder with ring magnet