Keep your trailer stable, stop rolling or trailer shifts, and gain peace of mind with this ‘X' or ‘Scissors' type chock to stabilize tandem axles. Each chock adjusts to fit your tandem axles using the included wrench to move the footpads against the wheels. This system works with your tire movements to create greater stability. Works with wheel gaps 1.5" to 5-3/4". Zinc-plated steel. Pair.