ESCO's Zafety Lug Lock in some ways is the "the safety belt for truck wheel nuts." Secures truck lug nuts to each other after they have been properly torqued, eliminating the chance for nuts to loosen under normal operating conditions which can result in possible dangerous wheel offs. Can be installed/removed by fitting them over two adjacent nuts on the truck wheel/rim. Made from design engineered plastic, they can withstand extreme plus and minus temperatures -40F to +302 degrees F. Lug Locks are available in both standard and high temperature units.