Ultra-Fab Products 21-001094 Super Grip Chock (X-Large ，1 Pack)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Anchors opposing wheels of tandem axles</li><li>Eliminates front-to-back rocking motion</li><li>Superior handle design reduces slippage while mounting between tires</li><li>Collapses to 3.5" and expands to 17"</li><li>Heavy duty steel construction</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41ESyhLUKLL.jpg" noproxy>