Converts a standard three-prong electrical outlet into a universtal groundable point for wrist straps and other grounding hardware with banana plugs. The adapter combines a banana jack (.162” - .164" ± .002" ID) has two durable plastic prongs with a metal ground plug. The outlet adapter is an excellent accessory for earthing/grounding. Perfect for mobile situations - It is very easy to move and conventient to install so your can move to different outlets or locations as needed.