Louisville® Extension Ladder, Extra Heavy Duty Professional Single, series: AE2100, 8 ft Overall Length, ANSI Code: Type IA, 300 lb, Aluminum, 10 ft 8 in Maximum Working Length, 8 ft Section Length, 12 in Adjustable Increments, 17-7/8 in Outside Shoe Base Width, I-Beam Rail, Swivel Safety Shoe. Louisville® AE2108 AE2100 Extra Heavy Duty Professional Single Extension Ladder, 8 ft OAL, 300 lb Load, 12 in Adjustable Increments