One fifth of the design: The packaging includes 2 HVAC maintenance vehicle tube expander tools. There are five sizes on the drill bit: 1/4 inch (6mm), 3/8 inch (10mm), 1/2 inch (12mm), 5/8 inch (16mm), and 3/4 inch (19mm). You don't need to change different exercises. High quality: These waving drill bits are made of high-quality chrome vanadium steel, which is harder and more durable. Rupture and deformation are not easy and can work for long periods of time. Practical and efficient: The copper tube expander supports tube expansion and flare functions. It is suitable for air conditioning maintenance. Easy to use: The copper burning tool with a 1/4 inch handle can be easily installed on an electric drill and extended with copper tubes. It is and easy to carry. Attention: Please do not touch directly to avoid combustion, as heat will be generated when expanding the pipeline. Widely used: The HVAC maintenance group is suitable for most copper pipes, such as air conditioning maintenance, refrigerator maintenance, copper pipe maintenance, etc. Colour:Black Material:Metal Package Contents: 2 * Tube Expander Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.