How many 510 linebackers in nfl?

The term "510 linebackers" typically refers to linebackers who are 5 feet 10 inches tall. In the NFL, very few linebackers are that height, as the position generally favors taller players for better reach and coverage abilities. Most linebackers are usually around 6 feet to 6 feet 3 inches tall. Specific numbers can fluctuate with roster changes, but historically, 5'10" linebackers are quite rare in the league.