Breaking down NFL combine DLs

When evaluating defensive linemen, it's important to examine all aspects of their game -- ability to rush the passer and defend the run, instincts, motor, toughness and quickness.

Below is an explanation of the categories in which Scouts Inc. grades defensive line prospects, as well as our ranking of all defensive linemen invited to the 2013 NFL combine. Also included in this cheat sheet are five-year measurement and timing trends, picks from Rounds 1 and 2 of the 2012 draft, and recent D-line market trends.