Aluminum Twin Step Ladder 1. OEM service 2. One-stop ... :Stamping: Rolling, forming, punching, bending, deep drawing. Metal Fabrication: Wire EDM, drilling, turning, milling, grinding. Welding: Electro welding, argon ... , injection molding. Usage of products: 17 ft. Aluminum Twin Step Ladder telescopes and folds to offer a variety of ... 86) 21-5970-6057Fax: (+86) 21-6979-9291 Aluminum Twin Step Ladder