Five Row Bleachers with Guard Rail or Chain Link with or without Aisle! All aluminum seat planks and steel understructure provide a lightweight, stable bleacher. Planks are supported by a strong, galvanized steel understructure made of 3/16" x 1-1/2" steel angle. Dual braces and rear stabilizing bar for additional strength and stability. Risers and double-foot planks above 30" for added safety. Aisle option includes 2" O.D. handrail in center of bleacher. 15' Long, 5 Row, seats 50.