Features 1、Multiple Specifications: The kit contains 5pcs tube expanders of different specifications, which can meet various copper tube expansion situations. 2、High Carbon Steel: These tube expanders are made of high carbon steel material, with high hardness and wear resistance. 3、1/4in Hex Handle: With standard 1/4in hex shank, which can be installed on a general hex shank electric drill. 4、Perfect Fit: Longer expander swaging bits can provide greater forging depth to achieve perfect fit. 5、For Air Conditioner: Often used to expand the copper pipe when installing or repairing the air conditioner, and the operation is simple. Specification Item Type: Tube Expander Set Material: High carbon steel Purpose: Copper tube expand device Colour: Black Hex Handle Diameter: 6.35mm(1/4in) Specifications: 3/4in, 5/8in, 1/2in, 3/8in, 1/4in Package List 5 x Tube Expander