Louisville® Twin Front Ladder, Ribbed Type IAA, series: FM1400HD, 6 ft Ladder Height, 375 lb, ANSI Code: A14.5, Fiberglass, 5 Steps, 52-5/16 in Base Spread, 22-9/16 in Bottom Width. Louisville® FM1406HD FM1400HD Ribbed Type IAA Twin Front Ladder, 6 ft H Ladder, 375 lb Load, 5 Steps, A14.5