The Sata 3/8 Drive Metric Spark Plug Socket 21 mm features a single hex (6pt) fastener end design, ensuring a secure grip on fasteners while reducing rounding. It is equipped with off-corner loading to minimize fastener rounding, improving performance. The socket boasts large, easy-to-read markings for quick size identification and a double line (SAE) & knurled line (MM) design for simple recognition of standard and metric sockets.

Made from high-quality chrome vanadium alloy steel (Cr-V), this socket is heat-treated for long-lasting durability. Its bright, full polish chrome finish not only resists corrosion but also wipes clean with ease. The socket is designed to meet industrial specifications, offering a thin wall design with precise nut end dimensions for optimal strength and reliability.