Two flat plates of hardened steel having a semi-circular groove cut in the edges making contact with each other. This groove has an internal thread, so that when the two pieces are brought together in a stock a female screw is formed. It is used for cutting threads on rods, bolts, etc.
Rule set on a plate to seal, cut, shape, punch holes into plastic material. Usually made of brass or steel. Brass lasts longer but costs more. Surface area is calculated by measuring (width x length) of rule.
Tools or devices for creating a desired shape, form, or finish with a source material. Dies range from simple to complex, requiring anywhere from one to a number of impressions to form the desired shape. In forging, dies are usually paired up to exert pressure on both sides of a metal part.