Universal coupler lock fits virtually all 1-7/8″, 2″, and 2-5/16″ trailer couplers. Bright red finish discourages thief’s from messing with your trailer. Resists rust and corrosion. Simple installation and removal. Advanced locking mechanism resists picking and prying. We can NOT key two (2) of these locks the same. The similar 379KA coupler locks are available keyed alike. The only difference between this one (389DAT) and the 379KA is the color.