Manual refrigeration tool expansion tube copper mold stamping die from air conditioning tube copper tube Things: Double head, small size, more suitable for narrow space design, flexible construction. Redefine the spring, take it free, save time and work. Specifications: Material: iron and zinc alloy Tube diameter range: 4-22mm copper tube Note: Please wait for 1-3mm difference due to manual measurement. Due to the different displays and different lighting, the image cannot display the actual color of the item. thank you for understanding.