1. Screw connection: the threaded part on a single handle is nested with the threaded hole at the bottom of the enamel pot pit, and then fixed together by rotating and screwing.

2. Rivet connection: the single handle is fixed at the bottom of the enamel pot pit with rivets, and a gasket is usually installed between the handle and the pot wall to enhance the reliability of the connection.

3. Welding connection: weld a metal tray at the bottom of the enamel pot pit, and then connect it with a single handle, and the two are tightly fixed together by welding.

4. Bonding connection: Apply the glue on the single handle to the bottom of the enamel pot pit, then put the single handle on it, and realize the connection by bonding.

Threaded connection and rivet connection are the most common connection methods at present, which are stable and reliable and can bear greater weight and pressure.