This seat belt buckle lock is designed to be installed on existing seat belt buckles for a more secure connection. Ideal for traveling with children, providing added peace of mind regarding your child's safety in the back seat. [Sturdy Material] The car seat buckle is made from high-quality, thick, durable plastic material, built to last for long-term use. [Easy to Use] Each set includes two seat belt caps and two keys, allowing you to equip both rear seats. The locks can be easily installed and removed using the included key. [Easy Application & Function] This seat belt buckle adapter is designed to prevent children from secretly unbuckling their seat belts while driving. It is used to secure child seats and enhance safety during travel. [Important Notes] Please ensure compatibility with your seat belt buckle size before purchasing. These seat belt locks are suitable for most vehicles but must not be used on the front passenger seat. They are intended for rear seat use only. Note: All measurements are taken manually. Please allow 1–3 cm variation due to differences in lighting and display. Color may vary slightly depending on screen settings. Please refer to the actual item received.