It means that after entering March and before the last trading day, the minimum position of investors holding copper, aluminum and zinc contracts in Shanghai Futures Exchange must be an integer multiple of 5. For example, if an investor holds a copper 1503 three-hand futures contract, he must change his position into a five-hand futures contract and a 10 futures contract before entering March. . . Wait for an integer multiple of 5, or close all 3 positions.

The purpose of this 1 is to remind individual investors of risks when the delivery month is about to enter, and to facilitate delivery matching.