Abstract: A hook connection structure of a shelf is configured to connect a fixing rod between two hooks which are connected on two bottoms of two connection racks, and the fixing rod is mounted below a holding plate by using the two hooks. The hook connection structure contains: a respective one hook including a connection portion which has an extension, an engagement section, a contact rib, and a stop tab. A respective one of two connection racks includes a slot formed on an elongated portion of the respective one connection rack, a notch defined on the slot, such that the stop tab of the extension of the respective hook abuts against the elongated portion of the respective one rack, the respective one hook is connected on a bottom of the respective one connection rack, and the fixing rod is mounted below the holding plate to hang objects.

Abstract: A positioning structure of a frame welding assembly for a metal product, the metal product is a holding plate or a holding basket made of metal mesh and contains: multiple bodies, each of the multiple bodies is folded in a square shape and includes multiple raised faces and multiple slots which are stamped on a peripheral side of each body respectively. Two adjacent of the multiple bodies are connected together, and the two adjacent bodies have multiple recesses and multiple protrusions respectively formed on two connection sides thereof so that the multiple recesses retain with the multiple protrusions individually before welding the two adjacent bodies together.