Just a heads up that this is an L shape, not a U shape: it doesn't wrap around the top of the door but sort of hangs from the top ledge. Not a huge deal, but it might not be obvious from the photos.
It does NOT come with a bolt or fastener for the board. You will need to use a bolt with two nuts to secure your dartboard to the hanger.
The metal is completely flat: ie your bolt does not rest in a recessed hollow on the door's side. They provide velcro to cover the bolt to protect the door. Not ideal.
For my Arachnid board the provided holes were nowhere near where I needed. I drilled my own hole and recessed it using a ball peen hammer.
Overall it works fine, but for $45 I thought they could at least provide the bolt.