Material: Made of bearing steel. It has a high and uniform hardness and wear resistance and a high elastic limit, durable and easy to use, your good assistant for work and life. Size: 5 pieces of bell mouth expander, handle diameter: 1/4 inch (6.35mm) hexagonal handle specifications: 3/4 inch (19mm), 5/8 inch (15.9mm), 1/2 inch (12.7mm), 3/8 inch (9.5mm), 1/4 inch (6.3mm); 6 pieces of expander: 7/8 inch (22.2mm), 3/4 inch (19mm), 5/8 inch (15.9mm), 1/2 inch (12.7mm), 3/ 8 inch (9.5mm), 1/4 inch (6.3mm) Easy to Use: Perfect for installers, no matter if you are just learning or doing it. Good performance and long life, full range of forging tools makes it easier to extend pipes. Great Pressing Tools: Revolutionizing system for molding tubes using heat by friction way more surface of between the flare and the Valv e.The flares will always have the same size and will fit perfectly; The swages present a perfect depth and a tight fitting, that will make the brazing easier, reducing the fatigue stress over the coupling area. Multi-Function: Preserving the ductility of copper/aluminum during die forging to avoid cracks and leakage. When air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill.) Colour:black Material:steel Package Contents: 22 x Copper Pipe Swaging Tool Drill Bits