5.5 mm Square Alloy cross chains allows for added traction and durability. Square link provides the traction of the v-bar without the added profile of a welded v. The square design wears more evenly, unlike the twisted link that wears only on its high points. For easier installation of Square Straight Link Chains see our Sno-Chain Ramps . Optional rubber or spring tensioners are recommended. IMPORTANT: If your tires are deep lug, mud, load range E, or AT tires, please contact us prior to purchasing.For plowing or extended use, the Heavy duty truck tire chains below are recommended when available in your size.