Icon Professional Impact Socket Extensions are designed to stand up to professional shop use. We use a premium heat treated chrome moly steel, with a durable black phosphate finish that offers superior strength and corrosion resistance. All Icon socket extensions have a durable spring-loaded ball detent to provide a secure fit on the socket. We\’ve also added easy-to-read size markings, and included a premium storage tray to help keep your tools organized. Like the rest of the Icon hand tools, these socket extensions are backed by a hassle-free, manufacturers lifetime warranty. Provides extra length for hard-to-reach work spaces Precision-forged for maximum grip and torque High visibility stamped size markings for easy identification Premium storage tray included