Combined tooling is to assemble the chassis, tray, column, spacer tube, and basket into a whole according to the requirements of use, and it is applied in the heat treatment environment. It is easy to load and unload, flexible to use, and applicable to small and medium-sized workpieces, so it is widely used in the heat treatment industry. German standard materials such as 1.4852, 1.4849, 1.4848 are routinely used, and materials can also be provided according to customer requirements.