Ultra-Fab Products 21-001080 X-Large Ultra Chock and Lock<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Eliminates front to back motion by anchoring the opposing wheels of tandem axle trailers and fifth wheels; When engaged， the trailer wheels actually work against each other to arrest any created motion regardless of ground surface or slope</li><li>One piece with easy to use lever; Can be locked to minimize theft (lock not included); Heavy gauge all steel construction with corrosion resistant zinc plating</li><li>This XL Model collapses to 4.5" and expands to 10"</li><li>1 per box</li><li>Manufactures Lifetime Warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41xU8t%2BxNCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31EN-vcmpkL.jpg" noproxy>