Check the listing for details. Master Lock - (1 Keyed Alike Universal Trailer Coupler Locks. Color: Black, Condition: New. Listed at 52.89 USD. Universal Trailer Coupler Lock by Master Lock - Model # 379KA. This lock protects unattended trailers and guards against tow-away theft. Fits 1-7/8", 2", & 2-5/16" couplers by Reese, Fulton, Valley, Atwood, Shelby, Putnam, Hammerblow, Dutton, Lainson, and UFP. This listing is for one universal coupler locks keyed alike. Use this listing when purchasing odd quantities of keyed alike universal coupler locks. When purchasing odd quantities - purchase as many keyed alike two packs #379KA-2 as needed and then one single keyed alike lock. The two pack 379KA listing can be found in our Amazon storefront "LocksChocksTiedowns" by clicking our company logo. For quantities greater than six, please inquire and we can normally have them in a few days.A high quality trailer coupler (tongue) lock.Each lock weighs 2.4 lbs. Fits virtually all 1-7/8, 2", and 2-5/16" couplers.Advanced locking mechanism resists picking and prying and is rekeyable - for rekeying see your authorized Master Lock locksmith.Limited Lifetime Warranty. Resists rust and corrosion. Simple installation and removal.