The TOLSEN 1/2" impact socket set provides a practical solution for high-torque fastening tasks, including a selection of 17 mm, 19 mm, and 21 mm sockets. These tools are crafted from heat-treated Chrome-Molybdenum steel with an oxidative surface treatment, ensuring they can withstand the intense stress of pneumatic, electric, or manual impact wrenches without failing. To help you quickly identify the right size during a busy job, each socket features a distinct color code: blue for 17 mm, gold for 19 mm, and red for 21 mm. They come equipped with PP protection caps to shield the components and are organized in a plastic storage case, making them a reliable choice for mechanics or DIY enthusiasts who need durable sockets for heavy-duty automotive or industrial work.