High-quality Material: This 21-piece socket set is made of high-quality chrome vanadium (Cr-V) steel, ensuring durability and long-lasting performance. Each socket features a matte chrome plating that increases corrosion and rust resistance, ensuring stable performance in various working environments. Wide Range of Sizes: This set includes 21 sockets of various sizes with a 1/2-inch (12.5 mm) square drive for metric sizes from 8 mm to 36 mm. The wide range of sizes meets different tightening torque requirements and is suitable for a wide variety of automotive repairs and industrial applications. Maximum Compatibility: The internal thread sockets are designed with a tooth profile that is compatible with a variety of torque tools, including torque wrenches and impact wrenches. Whether metric or imperial size, these sockets offer perfect compatibility and increase the versatility of the tools. Efficient Design: The special Gear Lock profile of these sockets ensures a firmer and more