Finally a good solution for this VW engine case problem area! The stock VW plug for the oil relief area is notoriously hard to tighten with a slotted screwdriver. While some companies have tried to solve the problem with hex head plugs, you will find that the diameter of these plugs requires a customized shaved down socket to install. These compact Allen head drive units install just like the original ones, but with an easy to drive 3/8″ or 10mm driver. Super neat! Order one for single relief cases up to 1970, or two for dual relief cases 71 and later.