2PCS OIL DRAIN PLUG KEY FOR VW AUDI, 1/2" DR., H17, M16 H17 M16 1/2" DR Spline Socket Bit Oil Drain Plug Key For VW Audi Automatic Gearbox Transmission Drain Screw Wrench Repair Tool Not just for oil drain plugs, this tool is also ideal for radiator drain plug removal and sealant application. The 1/2" DR spline socket bit features a unique design for secure grip on VW Audi oil drain plugs. Designed for VW Audi, this tool ensures a perfect fit for automatic gearbox and transmission drain screws.