3 Row Standard 6 inch Low Rise Bleacher Galvanized Frame 21 foot. No guardrails needed as this model is under 30". Single Footboard, 6" LOW Rise, 2" x 12" seats.1.75" x 1.75" x 2" x 2" x 3/16" Angles. 60" depth, 12" to top of first row, 24" to top of back