I am sure you know what the wing top 5 bar protectors are ... if so, ... this is the hood protector version of the same (in black). It goes in the recessed area of the hood. It allows you to sit or stand on the hood to access your roof rack or for other reasons (kids sitting on the hood or the like).
Google Mantec Hood Protector for Defender 90 and you'll see what I'm talking about. This one is new and still in the shrink wrap, so I don't have a picture of it installed.