7.0 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.