Features 1、These swaging tool drill bit set is made from quality bearing steel, which is sturdy and durable. 2、This tool can preserves copper aluminum malleability while doing the swaging, avoiding cracks and leakages. 3、When the air conditioner is installed, the copper pipe expands and connects the two copper pipes to each other. 4、Suitable for the expansion of copper and aluminum pipes, with a variety of sizes to choose from. 5、These swaging tool drill bits are convenient and practical for pipe expansion, and has a wide range of uses. Specification Item Type: Swaging Tool Drill Bit Set Material: Bearing Steel Purpose: Tube Expander Colour: Black System: Inch Expander Size: Approx. 7/8 (22.2mm / 0.87in), 3/4 (19mm / 0.74in), 5/8 (15.9mm / 0.62in), 1/2 (12.7mm / 0.5in), 3/8 (9.5mm / 0.37in), 1/4 (6.3mm / 0.24in) ) Expander Height: 7/8 and 3/4 Are 5.5cm, 5/8 and 1/2 Are 5cm, 3/8 and 1/4 Are 4.5cm Package List 6 x Swaging Tool Drill Bit Set