Item Type: Tube Expander_x000D_Material: Bearing steel_x000D_Shank Diameter: Approx. 7mm / 0.3in_x000D_Colour: Black_x000D_Shank Diameter: 1/4in (approx. 6.35mm / 0.3in) hex handle_x000D_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)_x000D_Height: Approx. 4.5cm / 1.8in 1Bearing steel material has high and uniform hardness and wear resistance, and high elastic limit. 2With standard round handle, it is not easy to fall off when installed on tools such as electric drills. 3The kit contains 6 sizes of expanders, suitable for different air?conditioning copper pipe expansion. 4This pipe expander is mainly used to expand copper pipes and connect the two copper pipes tightly when installing the air conditioner. 5Can maintain good ductility during the expansion process, which can prevent the copper pipe from cracking and leaking.6 x Tube Expander