Function: The car seat belt buckle prevents the child's arm from falling off the seatbelt and ensures that your child is secured in the seat. Quality: This car seat chest clip lock is made of high quality plastic and webbing material. Durable, safe and non-toxic. Dual-Lock Design: The child harness clip with dual-lock ensures that the seat belt is not easy for children to unbuckle but can be easily unbuckled by adults, safer for children. Easy to Use: Chest clip guard for car seat, effectively ensure the safety of the driver and backseat passengers on the road. Size: 13.5 cm / 5.3 inches in lenth. Suitable for use with most child car seats, strollers, high chairs, baby chairs seat belts. Chest clip guard for car seat: 13.5 cm / 5.3 inches in lenth.