Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch.

Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch. The Master Lock 378DAT features a 2-5/16 in. (59 mm) trailer coupler lock, designed to resist rust and corrosion. The advanced locking mechanism provides resistance to picking and prying. Fits most couplers 1-7/8 in. (48 mm), 2 in. (51 mm) and 2-5/16 in. (59 mm) from brands such as Reese®, Fulton®, Valley®, Atwood®, Shelby®, Putnam®, Hammerblow, Dutton Lainson®, UFP. The Lifetime Guarantee provides peace of mind from a brand you know and can trust. The lock is made from hardened steel for improved resistance to cutting and shearing. Coupler lock is best used for trailers; Works best with Straight Tongue Trailer Couplers. Advance locking mechanism resists picking and prying. Designed to resist rust and corrosion. Fits most couplers 1-7/8 in. (48 mm), 2 in. (51 mm) and 2-5/16 in. (59 mm); Does not fit Gooseneck Trailer Couplers. Includes one trailer coupler lock, two keys.