Undrafted free agents are the heart and soul of an NFL roster. They're the underdogs who overcame. They didn't get to hear their names during draft weekend called yet make sure everyone knows their names eventually.

We break down the 14 UDFAs who will be aiming to make the Raiders' 53-man roster — or at least the practice squad.

The Eagles, who live to draft offensive linemen, feasted on the position on Day 3 after surprisingly passing on both guards, tackles and centers in the first four rounds. They drafted three offensive linemen with their final five picks.