Feature: 1. 6 piece set, with the most common HVAC pipe diameter: 1/4inch, 3/8inch, 1/2inch, 5/8inch, 3/4inch, 7/8inch. 2. Made of high-quality metal materials, High quality to use. 3. Preserve the ductility of copper/aluminum during die forging to avoid cracks and leakage. 4. Suitable for hard and soft copper standardized, easy to braze swaging set. 5. The forging stopper will provide a large swaging depth to achieve a perfect fit. 6. When installing the air conditioner, expand the copper pipe to connect the two copper pipes with each other. (It needs to be installed on a hand drill). 7. Sufficient quantity, complete specifications, perfect to complete your work needs. Specification: A full range of forging tools makes it easier to expand HVAC pipes. Features: 6 piece set, with the most common HVAC pipe diameter: 1/4inch, 3/8inch, 1/2inch, 5/8inch, 3/4inch, 7/8inch. Made of high-quality metal materials, High quality to use. Preserve the ductility of copper/aluminum during die forging to avoid cracks and leakage. Suitable for hard and soft copper standardized, easy to braze swaging set. The forging stopper will provide a large swaging depth to achieve a perfect fit. When installing the air conditioner, expand the copper pipe to connect the two copper pipes with each other. (It needs to be installed on a hand drill). Sufficient quantity, complete specifications, perfect to complete your work needs. Specifications: Material: Metal Package Weight: 150g / 5.29ounces Package Size: 120 * 80 * 27mm / 4.72 * 3.15 * 1.06in Packing List: 6 * Tube Expanders Package List: 6 * Tube Expanders