Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock (fits all couplers)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>One size fits most coupler types</li><li>Dual ratchet lock System</li><li>Exclusive design provides 360 degrees of hardened steel protection</li><li>Key hole cover keeps out dirt</li><li>Attractive Ballistic grade Nylon housing</li><li>One size fits all (from 1-7/8"， 2"， to 2-5/15"， all coupler types)</li><li>Key hole cover slides up to seal out dirt and grime</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41H%2BdhUFTZL.jpg" noproxy>