Hinges are already attached to a side frame; that's nice. Installed it with no problems. But, make sure you measure 4 times before you drill holes. Comes with one-way screws, which won't come out once you start. Have to buy a one-way drill bit $14. Not sure what function the bottom bar has, there are no pre-drilled holes in the frame for this. It's steel, not aluminum like the doors on Unique Homes' website.