Industrial step ladder: 1. P ,S ,I type 2. easy installation and anti ... . fix by welding or bolts 4. width:125-305mm Industrial step ladder: We manufacture different styles of stair ladders that used in ... : mill steel black and hot dip Galvanizing / and stainless gratingUsage: ladder, flooring walkway, platform ,steel structures, stair tread, well cover, trench ...