Function: When the air conditioner is installed, expand the copper pipe to link the two copper pipes to each other.Material: bearing steel, durable, not easy to break, wear-resistant.Packing: 6-piece set.Use: simple to use, very suitable for installers.Specifications:Material: Alloy SteelFinish Type: BlackeningShank Type: HexSize: 6pcs different sizes include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1/4" hexagon handle.How to use:1. Choose the right drill bit according to the inner diameter of the pipe and the process requirements2. Insert the drill bit into the electric drill interface and clamp it tightly3. Tighten until the expander drill bit cap exits to complete4. It is recommended to fix the pipe fittings and then operate more accurately and efficientlyPackage Included:6 x Expander Drill BitDetail Pictures: