Bits and sockets sets with bit holder

Bit holder

— the presence of at least one bit holder in the set; there are kits where there are several such devices.

A bit holder in the classical sense is a kind of “extension” for bits of standard length, designed to be installed in a screwdriver (extended bits can be installed without additional devices). And in extreme cases, such a device can also be used as an impromptu screwdriver. In addition, in some sets, bit holders mean adapters from a hex to a square shank (for more details, see "adapter").