General description The 7Pcs Swaging Tool Drill Bit Set is designed for expanding copper tubing, making it an essential accessory for HVAC installers and air conditioning repairs. This set includes six different sizes of drill bits (1/4in, 3/8in, 1/2in, 5/8in, 3/4in, and 7/8in) along with a 5-in-1 flaring tool, allowing for versatile applications in pipe expansion. Technical specifications Sizes included: 1/4in, 3/8in, 1/2in, 5/8in, 3/4in, 7/8in Material: High-quality bearing steel Measurement allowed error: +/- 1-3cm Color: Wine red + black Installation Designed for use with manual electric drills Ensure drill speed is not too fast during operation Usage Ideal for expanding copper pipes to connect two pipes Maintains ductility of copper aluminum during die forging to avoid cracks and leakage Easy to use without complicated learning Recommended for HVAC installers Other information Please wear anti-scalding gloves and goggles during operation