ER933B Safety car auto buckle will lock your seat belt to add safety and move freely at the same time. This seat belt buckle possesses a strong metal button and a press button for adjust the belt. Easily to install， and best security for you. Durable and long lasting Adjustable Belt Buckle is suitable for any auto to use. Simply connect to the existing seat belt to secure the safety of you. It is made of hard plastic and metal material. Consist of 2 pcs in one pack.