Defensive tackles clog the middle and collapse pockets. Dominant ones who demand attention from two blockers make life much easier for defensive coordinators, who suddenly see their linebackers running to the ball unmolested.
And it's typically not a strength position in the Pac-10. Coaches who have worked both down south and out west will tell you that one of the peculiar differences is how many more DTs there are in SEC and ACC country. (Quarterback goes the other way.)
In 2010, however, defensive tackle is solid in the conference. The three teams at the top of this list feature potential All-Americans at the position.
So how do things stack up?
USC: The Trojans would rank among the nation's best at the position if not for the season-ending knee injury to Christian Tupou. Still, Jurrell Casey is a beast, Hebron Fangupo is huge and DaJohn Harris was one of the surprises of spring practices.
Oregon State: All-America candidate Stephen Paea is powerful and explosive and if he turns in a big season beating double-teams, he could end up a first-round NFL draft pick. Brennan Olander is a returning starter and converted end Kevin Frahm provides depth.
Arizona State: Both 2009 starters, Lawrence Guy and Saia Falahola, are back, and Corey Adams and Williams Sutton should provide quality depth.
Oregon: Brandon Bair is underrated, and Zac Clark saw plenty of action as a backup in 2009. While inexperienced, there's young talent to provide depth.
Washington: The Huskies are solid with Cameron Elisara and Alameda Ta'amu, returning starters who turned in their best work this past spring.
California: Hard to rate teams that use a pure 3-4 because there's only a single nose tackle. Still, if Derrick Hill can stay healthy, he and Kendrick Payne will be an outstanding tandem making life tough for opposing centers.
Stanford: The Cardinal is breaking in its own 3-4 this year. Nose tackle Sione Fua is solid in the middle, with Terrence Stephens his backup. Stephens saw limited action as a true freshman in 2009.
UCLA: The Bruins are replacing two starters, including the dominant Brian Price. David Carter, Justin Edison and Nate Chandler were solid in spring practices, so the position isn't a huge concern.
Arizona: The Wildcats are replacing two starters, including the underrated Earl Mitchell, a third-round NFL draft pick. After spring practices, Sione Tuihalamaka and Lolomana Mikaele topped the depth chart, which featured six names.
Washington State: Another position where the Cougars might be "better than you think," particularly if Bernard Wolfgramm can stay healthy. Touted JC transfer Brandon Rankin was impressive this spring, and true sophomore Anthony Laurenzi, a five-game starter in 2009, offers experienced depth.