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 &durable chrome vanadium steel construction will allow you to employ the torque you need to break free stubborn drain plugs &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, &Porsche transmission drain plugs. The socket also features a hollow tip design so it can be used on both standard &security style fasteners for added utility.