Features Multiple Specifications: The kit contains 5 pieces of pipe expanders with different specifications, which can meet different situations of copper pipe expansion. High Carbon Steel: These pipe expanders are made of high carbon steel with high hardness and wear resistance. 1/4" Hex Handle: With standard 1/4" hex shank that can be installed on a general hex shank electric drill. Perfect Fit: Longer expander swaging bits can provide greater forging depth to achieve a perfect fit. For Air Conditioner: Widely used for expanding copper pipe in air conditioning installation or repair, easy to use. Specification: Item Type: Pipe Expander Set Material: high carbon steel Purpose: Device for expanding copper pipes Color: Black Hex handle diameter: 6.35mm (1/4 inch) Specifications: 3/4", 5/8", 1/2", 3/8", 1/4". Package list: 5 x Pipe Expanders Package List 5 x Tube Expander