- One size fits all coupler types', "Trimax UMAX50 Universal 'Die-Cast' Dual Purpose Coupler Lock (fits all couplers)", 'One size fits all coupler types
- Key hole cover keeps out dirt
360 degrees of solid steel protection against trailer theft. The UMAX50 is constructed of solid hardened steel and fits most coupler sizes (1 7/8" to 2 5/16"). a 5/8" (16mm) hardened steel shackle helps ensure your trailer is secure, even when left unattended. It has a patented dual locking system and a rust proof hammer tone epoxy finish for extra security.