Since 1988, RACO Enterprises LLP has been providing thermoforming customers with high quality, durable steel Stacker Hinges (U.S. Patient #5,391,049). RACO Hinges are quick and convenient devices that can be used with less expensive materials than aluminum plate that does not require precise machining to maintain a close or friction fit. Stacker Hinges mount easily to a stacker board to create a landing surface for the stripped parts that prevents them from returning.