Master Lock 2-5/16" Hitch Ball & Clamp Trailer Coupler Lock 378DAT 20-0287

It fits 2-5/16 inch coupler. Features a advance locking mechanism. Protect unattended trailers with this coupler lock. This product has a nickel-plated, zinc die-cast body with a front access key-way for ease of accessibility. Ratcheting shaft accommodates most couplers. Advance locking mechanism resists picking & prying. Easy to install & remove.