Features Bearing steel material has high and uniform hardness and wear resistance, and high elastic limit. With standard round handle, it is not easy to fall off when installed on tools such as electric drills. The kit contains 6 sizes of expanders, suitable for different air‑conditioning copper pipe expansion. This pipe expander is mainly used to expand copper pipes and connect the two copper pipes tightly when installing the air conditioner. Can maintain good ductility during the expansion process, which can prevent the copper pipe from cracking and leaking. Specification: Item Type: Tube Expander Material: Bearing steel Shank Diameter: Approx. 7mm / 0.3in Colour: Black Shank Diameter: 1/4in (approx. 6.35mm / 0.3in) hex handle Specifications: 7/8in (approx. 22.2mm / 0.9in), 3/4in (approx. 19mm / 0.75in), 5/8in (approx. 15.9mm / 0.6in), 1/2in (approx. 12.7mm / 0.5in), 3/8in (approx. 9.5mm / 0.4in), 1/4in (approx. 6.3mm / 0.25in) Height: Approx. 4.5cm / 1.8in Package List:6 x Tube Expander Package List 6 x Tube Expander