The Master Lock No. 377DAT features a trailer coupler lock, designed to fit 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (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.

• Fits 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) trailer couplers.
• Advance locking mechanism resists picking and prying.
• Easy to install and remove.
• Resists rust and corrosion.