I've not seen this before. Possibly part of a set? Is the symbol before the word Shimano indicating that it is a slotted driver? Does it say anywhere what size the wrench is? That would suggest it is part of a set. If it were not, it wouldn't really make sense as a cyclist tool, since most bikes would require at least a few different sizes of metric Allen's wrenches and a box wrench wouldn't really be all that useful by itself. I guess this could be fore a specific component.