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, manufacturer’s lifetime warranty.