The Tolsen 16559 is a 9mm deep socket designed for hand-operated fastening tasks where extra reach is required. It is crafted from chrome-vanadium steel with a chrome-plated finish, ensuring the tool remains durable and resistant to corrosion during regular use. This socket features a 1/2" drive and an improved head profile specifically engineered to grip deformed fasteners more effectively. To keep the tool securely attached to your ratchet or extension bar, it includes a ball retaining groove. Its construction adheres to several industrial standards, including DIN3124 and ISO2725-1, making it a reliable choice for mechanics or DIY enthusiasts who need a precise fit for deep-seated bolts.