The STEELMAN 95647 16mm 1/2-Inch Drive 12-Point Triple Square Tamper-Proof Transmission Drain Plug Bit Socket for VW/Audi/Porsche is the tool you need when performing transmission service. The 1/2-inch drive size and durable chrome vanadium steel construction will allow you to employ the torque you need to break free stubborn drain plugs and the precision machined head will ensure an exact fit the first time, every time. The bit head is not a standard torx, hex, or screwdriver type but the 12-point triple square, or XZN style, used on most Audi, Volkswagen, and Porsche transmission drain plugs. The socket also features a hollow tip design so it can be used on both standard and security style fasteners for added utility.