Michigan Ladder 3720-04 375 Pound Duty Rating Type 1AA Fiberglass Stepladder, 4-Foot Extra heavy duty extruded aluminum top with tool tray Double angle bracing on all back bars and bottom and top steps Aluminum angle feet with thick tread on all four legs to provide better footing Extra deep serrated aluminum 3 3/8" step Massive side plates with five steel rivets on each side of the front rail