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. Designed for extreme use without Cams on the side chain. Cams can interfere with side chain adjustment. Cams can open and create slack. Cams get clogged with mud. 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.