... prices 4. Excellent customer service Aluminum Extension Ladder 16 ft. Shanghai Yi Jing Mold Factory Our company ... Painting, Powder, Anodizing, E-coating, Silkscreen, Heat treatment, Black oxide) custom to customer's request. Making Process:Stamping: Rolling ... casting, investment casting, injection molding. Usage of products: 16 ft. Aluminum Extension Ladder provides dependable, twist-proof performance ...