It's 4 yards to either side of the ball. It has nothing to do with tackles or ends. It's strictly a yardage issue. If any part of the player is within 4 yards of the ball, he's in the FBZ. So it poses no problem for a G, T, and TE to all be in the FBZ in a normal formation.
4-17-1
The free-blocking zone is a rectangular area extending laterally 4 yards either side of the spot of the snap and 3 yards behind each line of scrimmage. A player is in the free-blocking zone when any part of his body is in the zone at the snap.
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