Abstract: A device for accurately supplying a fluid such as a cutting fluid to the cutting portion of a tool of any of a wide variety of tools includes a tool holder having an internal fluid passageway and a forward end formed to include an annular fluid supply groove in communication with the fluid passageway, a nozzle ring having nozzles communicating with the annular fluid supply groove, and a coupling ring, which is screwed onto the forward end of the tool holder, for fixedly fastening the nozzle ring to the tool holder in an attachable and detachable manner. A cutting fluid from a fluid supply source is fed under pressure to the nozzles of the nozzle ring through the fluid passageway and the annular fluid supply groove, and the cutting fluid is jetted from the nozzles toward the cutting portion of the tool, such as a drill, held by the tool holder.