The left tackle (LT) is usually the team's best pass blocker. Of the two tackles, the left tackles will often have better footwork and agility than the right tackle in order to counteract the pass rush of defensive ends.
In football, the left tackle is generally considered the most skilled blocker. The left tackles tend to have better mobility and quickness than their counterparts on the right side, which enables them to effectively defend against the opposing team's pass rush.