The BulletProof Latch Lock is a great way to ensure your coupler stays locked onto your hitch. It's simple threaded design is easy to use and is effective again trailer theft. The universal design is compatible with all 1-7/8", 2" and 2-5/16" couplers. All BulletProof locks are treated with an aircraft-grade lubricant for longevity comes with 2 keys.