Tooth bars - two square templates used on the thread rolling machine, made of DC53 material or SKH-9 high-speed steel, divided into two pieces, one long and one short, the long plate is a movable plate, the short plate is a fixed plate, with tooth patterns on it, used to extrude screws into threaded molds.
The tooth bar is called "tooth bar" by southern wood craftsmen. It generally refers to the part set under the face frame to connect the two legs. Furniture with waist is the main connecting part below the waist. Those set in other parts are generally renamed tooth bars.

