Our all aluminum heavy-duty 4-row low rise bleachers are designed to seat more people than a standard 3 row bleacher without the additional expense of a guard rail system.These bleachers are constructed to ensure that the seat boards, footboards and cross bracing are maintenance free. Offers a lower overall height to meet UBC safety codes. Special features include a top seat under 30", special 12" wide seatboards, 1st seat under 12" and a 6" rise per row. See our selection of powder coated finishes to give your bleachers added character. Sizes available; 15' 4 Row seats 40 people 21' 4 Row seats 54 people 27' 4 Row seats 64 people The all welded understructure eliminates the liability of bolts backing out as found in most conventional systems. Seatboards are anodized aluminum, alloy 6063-T6, with 204R1 anodized clear finish. Footboards are mill aluminum using the same alloy. Understructure is manufactured using 2" x 1.5" x 3/16" aluminum angle, 6061-T6 alloy, mill finished. Channel end caps are fitted on all open ends.