Metal clamps arrived to Japan sometime in the early 20th Century, probably from the West. Clamps were adapted in Japan for holding small, fine work and are generally used to hold two pieces of a project together during marking and cutting. We have also found them to be ideal during the glue-up of small boxes and frames, and when working with our wooden nails.
Japanese woodworkers generally do not use their clamps to hold material to a bench during heavy sawing, planing or chopping operations, as these fine clamps do not impart the pressure required to overcome vigorous lateral forces. However, if you are looking for a refined tool to impart an easily controlled amount of pressure to a specific join during glue-up and assembly, these clamps are ideal.