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 spring-loaded ball detent for a secure fit on the socket. Impact extensions provide extra length for hard-to-reach work spaces. Easy-to-read size markings make selection easier. The premium storage tray is included to 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.