Trimax Premium Universal Unattended Coupler Lock - Keep your trailer attached with this universal trailer coupler lock. Features Fits most couplers from 1-7/8in to 2-5/16in. Dual Ratchet Lock System 360° Of ‘Solid Hardened Steel’ Patented Dual Purpose Coupler Lock Ballistic Grade Nylon Housing Absorbs Hammer Blows & Protects Against Weather