... good service 4.CNC Maching Detail information for aluminum extension ladder Aluminum Alloy 6063 6005 6061Certificate: ISO9001/ISO14001, OHSAS ... , stretch bending, milling, welding, fabrication etc.Packing: aluminum extension ladder wrapped in plastic film, carton box, wooden crates or as ... capacity could reach 30,000 metric tons.4. With 24 years' experience in marketing and producing, FENAN's products ...