For better connection of the two tubes, perfect expansion and filling tool. No more copper connection, just solder 1 side. New expander has been lubricated to facilitate expansion Service:We attach great importance to our customers' shopping experience. If you have any questions, please feel free to contact us, we will reply you as soon as possible within 24 hours Metal alloy and chrome frame.Ergonomic design reduces time and effort Made of steel, durable and long service life Widely used for soft copper tubes, aluminum tubes, titanium tubes, soft steel and other economical soft tube materials