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Fifth in an eight-part NFL draft series looks at defensive linemen.

Shawne Merriman,

6-4, 275, Maryland

Big enough to play end but was stand-up linebacker, so development is key.

Erasmus James,

6-4, 270, Wisconsin

Durability is biggest question for natural pass rusher.

David Pollack,

6-2, 265, Georgia

Relentless hustler and playmaker without prototypical size.

Marcus Spears,

6-4, 305, LSU

Great size and potential, although pass rush not a strength.

Luis Castillo,

6-3, 300, N’western

Coming on strong and could be first tackle taken.

Matt Roth,

6-4, 275, Iowa

Intense former top Illinois prep had good Senior Bowl week.

Sleeper

Jonathan Babineaux,

6-2, 285, Iowa

A little undersized for a tackle and overshadowed by Roth.

Keep an eye on

Dan Cody, 6-5, 260, Oklahoma: First end on some charts is a little thin.

Justin Tuck, 6-5, 275, Notre Dame: Good pass-rush instincts; merits look.

Travis Johnson, 6-3, 305, Florida State: Good size and ability.

Don Pierson

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In addition to Castillo, Roth and Tuck, tackles Jason Jefferson from Wisconsin and Leo High School (6-3, 308) and Notre Dame’s Greg Pauly (6-6, 295) could get calls on the second day.