Security Chain Company SZ335 Shur Grip Super Z Passenger Car Tire Traction Chain - Set of 2 Shur Grip Z is a patented SCC product that is designed to meet the traction product needs of the everyday consumer and is available to fit most passenger car tire sizes. Shur Grip Z offers a unique combination of performance and convenience features for every user. Full-metallic friction material. Security Chain Company SZ1172 Tire Traction Chain Rubber Tightener - Set of 2 This SCC Rubber Tightener is for use with select Shur Grip Z and Super Z6 traction tire chains. Replace your lost or broken tighteners, or you may want to keep a spare set on hand just in case. It is sold in pairs. Shur Grip Super Z class S cable chains with alloy steel material for traction (SZ335) Fast and easy installation of SZ335 chains with 2 included rubber tighteners (SZ1172) For use with most passenger vehicles (SZ335) SZ1172 tighteners are compatible with SCC part numbers SZ115-SZ137 and SZ315-SZ335 SZ1172 provides replacement tighteners or spares for SZ335 chains