The 9 mm chain with automatic tensioning and centering. Double patented “STOP&GO” device. Without the need to stop to tension the chain. • Approved according to the ON V5117 standard, it complies with the requirements of the Italian law DM 10 May 2011 and UNI 11313. • Diamond tread, in special alloy steel, with “D” section links for a safe grip on snow and ice. • High quality carburizing heat treatment. • Ergonomic and colored components, combined with clear instructions for use and gloves included, allow for quick and clean assembly. Supplied in a comfortable and elegant semi-rigid fabric case.