12 mm inside and on-the-tread clearance. Self-tensioning system: just one stop to fit the chain. Micro-regulation system for perfect tensioning of the chain. Special pattern chain design with double traction plates welded to increase grip and performance on snow. Anti-scratch nylon bumpers protecting alloy wheels (optional application). Innovative design and unique color-coded assembling points. Homologations/certifications/conformity: Ö-Norm 5117, Ö-Norm 5119, UNI 11313 / CUNA, incl. Component Test Report. Set consists of two snow chains for one axle.