2pack Ultra-Fab Chock N Lock - This chock lock eliminates front to back motion by anchoring the opposing wheels of tandem axle trailers and 5th wheels. When engaged, the trailer wheels actually work against each other to arrest any created motion regardless of the ground surface or slope. They have a one piece design with an easy to use lever and can be locked to minimize theft (lock not included). They have a heavy gauge all steel construction with a corrosion resistant zinc plating for long life. This easy to use, one piece stabilizer chock collapses to just 1.5 inch and expands up to 5 inch. The E-Z grip handle helps to give you better leverage. 2 per package.