BORON ALLOY 10B21 STEEL LASTS UP TO 83% LONGER THAN STANDARD ROCKWELL 53 STEEL. V-BAR Heavy duty twisted link Truck Tire Chain. 7.14mm thick. Recommended for over the road, chain law, semi trucks.For plowing or extended use, the Heavy duty truck tire chains below are recommended when available in your size. For easier installation of twisted link Truck Tire Chains see our Sno-Chain Ramps. Optional rubber or spring tensioners are recommended. If your tires are deep lug, mud, load range E, or AT tires, please contact us prior to purchasing.