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. 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. Available in one or two pack. Easy to use, one piece stabilizer chock collapses to just 1.5Unique design eliminates front-to-back rocking motionWorks by anchoring the opposing wheels of tandem axle trailers and fifth wheelsLockable to prevent theft (padlock not included)E-Z grip handle creates better leverageTough, all steel construction"