Vehicle Ventilation Solution: Allows air flow in your vehicle for those times you need to leave your dog in their cage in your vehicle Multiple Size Options: Available in three different sizes to fit various vehicle types and door mechanisms Secure Ventilation Design: Designed and used to help create secure ventilation while keeping your vehicle locked Essential Dog Travel Accessory: A tool no dog vehicle should be without for maintaining proper air circulation Color Variation: May come in grey or black, not to be used when the vehicle moves 6 Inch Size Specification: This model measures approximately 170mm from the bar bottom to the end of the loop, not including the threaded hook, Manufacturer: Pawstrading