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. 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.