James Harrison highlights Pittsburgh Steelers' undrafted free agents

James Harrison is one of the greatest undrafted success stories, as the former Defensive Player of the Year is still producing at age 37. Justin K. Aller/Getty Images

Undrafted free agents: James Harrison, OLB; Alejandro Villanueva, LT; Chris Boswell, K; Ramon Foster, OG; Steve McLendon, DT; Robert Golden, S; Roosevelt Nix, FB; Tyler Murphy, QB/WR; Fitzgerald Toussaint, RB; Jordan Berry, P; Terence Garvin, LB.

Starts: Foster (12), Berry (12), Boswell (8), McLendon (7), Villanueva (6), Nix (4), Golden (3).

Highlights: The Pittsburgh Steelers are still cashing in on one of the best undrafted free-agent stories of the past two decades. At age 37, James Harrison is tied for the team lead with five sacks despite one start. He's in a perfect role as part of a four-man outside linebacker rotation. A few newcomers also have impressed in their first seasons in Pittsburgh. Villanueva is still raw as far as his technique goes, but he has loads of potential as an athletic, 6-foot-9 left tackle. Boswell, signed to replace place-kicker Josh Scobee after the team's 2-2 start, is in the top 10 in field goal percentage at 90.9 percent (20-of-22). Boswell is arguably the team's most important acquisition of the season after a nightmarish stretch of kicker injuries early in the season. OG Foster has started for much of the past seven years and has quietly put together a solid season. During training camp, the Steelers liked Nix's hard-hitting ways so much that they kept two tight ends on the roster, which is rare in today's NFL. Nix has helped the running game stay successful as a lead blocker. Golden is a core special teamer and captain, and McLendon is a serviceable run-stopper. All around, the Steelers continue to have success by combing the undrafted talent pool.