Product Feature Made of high-quality materials, durable. Rugged and easy to use, your good assistant for work and life. Easy to use, good performance and long life. A full range of forging tools makes it easier to expand HVAC pipes. Preserve the ductility of copper/aluminum during die forging to avoid cracks and leakage. 5/6 piece set, with the most common HVAC pipe diameter: 1/4inch,3/8inch,1/2inch,5/8inch,3/4inch,7/8inch. 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. Product Specification TypeTube Expander Material5Pcs: High-quality Steel 6PCS:Bearing steel ColorBlack Surface treatmentBlack Size7/8inch(22.2mm), 3/4inch(19mm), 5/8inch(15.9mm), 1/2inch(12.7mm), 3/8inch(9.5mm), 1/4inch(6.3mm) Quantity5/6Pcs Overall Length5Pcs:62/61/57/53/49mm 6Pcs:45/50/55mm FunctionExpand HVAC Tube Suitable forfor hard and soft copper standardized, easy to braze swaging set Package Included 5/6 x Tube Expander s