Amazon.com : bridgeport 11829ggb commercial 2-step folding stool, 300lb cap, 20 1/2w x 24 3/4d x 39 1/2h, gray : office products, alibaba.com offers 2,242 industrial a type ladder products. about 31% of these are cable trays, 31% are ladders, and 1% are ladder & scaffolding parts. a wide variety of industrial a type ladder options are available to you, such as aluminum, frp, and steel.. Alibaba.com offers 2,175 industrial ladder types products. about 30% of these are ladders, 1% are bookcases. a wide variety of industrial ladder types options are available to you, such as steel, aluminum, and frp.