The tongue-and-groove type of reinforced floor: what do double locks and Youling buckles mean? Which is more practical?

Due to the limited thickness, the reinforced bottom plate is generally 8- 12mm, so the double lock reduces the tensile strength of the necking. Uniqueline lock is a European patent lock, and almost all reinforced floor locks in China are similar to Uniqueline locks. Except for a few brands that have paid royalties, everyone is using this lock, which is very convenient to install.