Robust Bit-Check provides a quick overview of which tools are available for use. The bits that are not used are simply placed back in the holder and are never lost. Easy to carry, e.g. in a shirt pocket. Universal holder with strong permanent magnet and quick release attachment for bits with a 1/4" hexagonal drive according to DIN ISO 1173-C 6.3. For mounting in a screwdriver or the chuck of an a electronically controlled drill. With torsion form to prevent premature wear. Tempered bits for socket head cap screws, for universal use.