China Aluminium Alloy External Hinge Manufacturer Junying Supplies Aluminium Alloy Free Swinging Hinges for Doors and Cabinets, 100% Inspection. Type: External Hinge, Free Swinging Hinge. Material: Aluminium Alloy. Surface Treatment: Anodizing, Power Coating, Zinc Plated, Chrome Coated, Nickel Plated, etc. Application: Door, Cabinet.