The Tolsen 16571 is a 21mm deep socket designed for hand-operated tasks that require reaching nuts or bolts recessed deep within a mechanism. Built from heat-treated chrome-vanadium steel, it features a polished and chrome-plated finish that helps protect the tool from corrosion during regular use. This socket utilizes a 1/2" square driver compatible with DIN3120 and ISO1174 standards, incorporating a ball retaining groove to keep the tool securely attached to the handle. To make it more versatile for challenging repairs, the head profile is specifically improved to grip deformed fasteners more effectively. It is manufactured according to DIN3124 and ISO2725-1 specifications, ensuring a reliable fit for mechanics or DIY enthusiasts who need a durable tool for heavy-duty fastening work.