Function: when installing air conditioner, it is used to expand copper tubes and connect two copper tubes. Meet different requirements: The kit contains 6 kinds of tube expanders with different specifications, which can meet different air conditioning maintenance requirements. Save time: these tube expanders are accurately positioned and can be used with hand drills to save working time. Made of high-quality steel, it has good oxidation resistance and is not easy to rust after long-term use. Tips: If this is your first time, I suggest you try it on waste copper pipe first. And don't forget to cool pipe after extrusion, because it become very hot. Put on gloves! Application: Suitable for standardization of hard copper and soft copper, easy to braze, and plug provide greater swing depth to achieve . Colour:black Material:Carbon steel Package Contents: 2 sets * 6pcs tube expander Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.