die plate

Noun

 * 1) A die in the form of a metal plate.
 * 2)  A type of die for cutting screw threads on male fasteners; it is arranged in the form of a plate of tool steel with a graduated series of holes, each being the die opening for a certain size of screw. A predecessor of today's  sets, it is now considered an antique type of tool, no longer in common use but still sometimes desirable as a collectible among tool collectors.
 * 3) A metal plate that is part of a die.