From the Peerless website: Part Number 0153005. Auto-Trac snow chains feature a patented Automatic Tightening and Centering System: It automatically adjusts and tightens while you drive! This high impact, self-tightening ratchet system ensures a snug fit and eliminates the need to stop and retighten the chains after installation. The split outside chain with two ratchet connectors allow easy installation without moving the vehicle. Auto-Trac also features an aggressive diamond patterned cross-chain designed for superior traction and a smooth ride. The case hardened alloy cross-chains provide extended wear lift over standard link products.

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