The BulletProof Extreme Duty Coupler Lock is the ultimate choice in trailer protection. It features a 1" hardened solid steel bar, pick-resistant lock and cut resistant design. The universal design is compatible with all 1-7/8", 2" and 2-5/16" trailer couplers. All BulletProof Hitches? locking products are treated with an aircraft grade lubricant for longevity.