Compare our bleachers to other suppliers and you will find our quality meets or exceeds any other bleachers in the country. Our manufacturer has over 30 years of experience so rest assured you will be getting the highest quality available. Please allow 4 to 6 weeks for delivery. Some assembly required. These bleachers offer the following features: Single foot planks all aluminum construction so you never have to worry about maintenance, rust or corrosion. 15' 3 Row measures 15' L x 28.5" H x 4'6" D and seats 30 people. 21' 3 Row measures 21' L x 28.5" H x 4'6" D and seats 42 people. 27' 3 Row measures 27' L x 28.5" H x 4'6" D and seats 54 people. General bleacher specifications are as follows: Understructure mill finished 2" x 1.5" x 3/16" aluminum 6061-T6 alloy angle fully welded to eliminate the liability of bolts working loose Seat Planks 12" wide aluminum 6063-T6 alloy 204R1 anodized finish ribbed non-slip surface .078" minumum wall thickness Foot Planks mill finished aluminum 6063-T6 alloy ribbed non-slip surface .078" minumum wall thickness Channel End Caps fitted alumminum for all open ends eliminates sharp edges.