Easy to use: One set contains two seat belt plugs and two keys. This seat belt plug can be used for two rear seats. It can be easily removed and installed with just one key. Easy to use. Function: This car seat belt buckle adapter is designed to prevent children from secretly unbuckling the seat belt while driving. It is used to fix child seats and improve driving safety. Please note: Please make sure the size is correct before purchasing. The seat belt buckle is suitable for most vehicles, but not for the co-pilot seat. They are only suitable for rear seats. Note: All data are measured manually. Please allow 1-3 cm error. There may be color differences due to light and display differences. Please refer to the actual object received.