To provide a component for supplying a cooling or lubricating medium or the like which is not influenced by a strong air stream around a tool excited by the rotation of a disk-like rotary tool and can realize a large effect using a small amount of the cooling and lubricating medium.

At least one of annular fluid circuits 5a1 to 5a3, which are connected to an inflow port 5b, is bored in a plate member 10. At a position where the circular fluid circuit is divided, notched grooves 5c1-5c3 having length and width permitting at least the outer peripheral region of the rotary tool (circular saw) 2 to pass are provided. When the plate member 10 is disposed so that the outer peripheral region of the rotary tool is passed through the notched grooves, the cut port of the divided circular fluid circuit functions as a delivery port of a cooling medium or a lubricating medium supplied through the inflow port.