Use this sturdy, rustproof aluminum coupler lock with high-visibility yellow color to help prevent trailer tow away theft. Fits trigger-style, 2" and 2-5/16" ball couplers with flat lips. Features: Tamper-resistant, sturdy lock deters trailer theft by preventing hookup Fits over trigger-style coupler, engaging it like trailer ball does Would-be thieves can't secure your unhitched trailer to their tow vehicles Versatile unit fits over couplers with flat or rolled lips, blocking access to hitch ball opening Heavy-duty extruded, tempered aluminum body is strong, durable, and rustproof Lock housing features a double nickel chrome finish High-visibility yellow, powder coat finish resists corrosion Push-button lock sits on front of device for easy access Shuttered keyhole keeps out dirt and debris to prevent damage to cylinder Double-sided, automotive-type keys are simple to use 2 Keys included Multiple locks can be ordered keyed alike by selecting "Keyed Alike" option from drop-down menu above Made in the USA Specs: Application: trigger-style latch coupler for 2" or 2-5/16" ball Coupler must have flat bottom lip Maximum coupler width (including lip): 4-1/2" Maximum lip thickness: 0.31" 1-Year warranty Part number 20-1132