Master Lock Trailer Coupler Lock


Fits 1-7/8 inch (48mm), 2 inch (51mm) and most 2-5/16 inch (59mm) trailer couplers
Advance locking mechanisim resists picking and prying
Easy to install and remove

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The Master Lock No. 377KA features a trailer coupler lock, designed to fit 1-7/8 inch (48mm), 2 inch (51mm) and most 2-5/16 inch (59mm) trailer couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.
LOCK APPLICATION: Best used for vehicles, trailers, and RV hitch locks
EASE OF USE: Easy to install and remove
DURABLE DESIGN: Trailer coupler resists rust and corrosion; Advanced locking mechanism resists picking and prying
SPECIFICATIONS: Fits 1-7/8 in., 2 in. and most 2-5/16 in. trailer couplers
INCLUDES: One trailer coupler lock, two keys


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