Robust Bit-Check 12 Metal 1. 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. Including universal holder with strong permanent magnet for bits with a 1/4" hexagonal drive. For mounting in a screwdriver or the chuck of an a electronically controlled drill. Multicomponent Bit-Check, can be set up for permanent and safe bit management.