SnowCruiser Compact 3 (with New NASA style locking systems) Suitable for passenger vehicles width 185  225mm Ex) 195/65R15 - 225/50R17 ALL NEW "NASA type" Locking system for greater safety, ease of use and durability. Auto-Locking feature is standard on all SnowCruisers products for incomparable safety and easy of attaching and detaching. Stronger & Safer! Easy on easy off! No more missing parts! No more noise & vibration! Designed for Zero Tolerance (small gap between the tire and fender wells) passenger vehicles including luxury and sports cars.