Features: *100% brand new and high quality. *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 kind size for choose from with the most common HVAC pipe diameter: 1/4inch 3/8inch 1/2inch 5/8inch 3/4inch *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: bearing steel, blackened surface treatment *Color: black *Size: 3/4inch(19mm), 5/8inch(15.9mm), 1/2inch(12.7mm), 3/8inch(9.5mm), 1/4inch(6.3mm) *Shank Model: 6.35mm hex Shank *Optional Quantity: 5pcs/1pcs Package Contents: Package 1 5*tube expander Package 2 1*tube expander Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.