This 6piece swagging drill bit kit gives HVAC technicians and DIYers a fast, reliable way to expand copper tubing for refrigeration and airconditioning systems. Key features and benefits Complete 6size set: includes 1/4', 3/8', 1/2', 5/8', 3/4' and 7/8' swagging bits to cover standard HVAC copper tube expansion needs (suitable for pipes in the 5–20 mm diameter range). Durable steel construction: grade steel resists deformation under load, maintaining shape and cutting geometry for longer service life and consistent results. Drillcompatible design: use the bits with hand drills or electric drills for workshop or onsite work—no special tooling required. Accurate, repeatable flares: finely ground cutting edges produce uniform expansions that support leakproof connections in refrigeration and AC systems. Saves time and reduces rework: consistent swaging reduces the need to recut or reflare tubing, improving job speed and reliability. How it solves common problems Eliminates fitment issues from uneven swaging by producing consistent, concentric expansions. Reduces tool changes and downtime by offering six commonly used sizes in one compact kit. Built to withstand field use and repeated cycles without quickly losing precision. Typical applications HVAC installation: expand copper lines when fitting flare nuts and service valves on residential and lightcommercial airconditioning systems. Refrigeration maintenance: prepare tubing ends for brazing or flared fittings during repairs and component replacement. Onsite service and fabrication: use with a handheld drill for quick tube expansion during emergency repairs or mobile service work. Usage notes Compatible with standard drills; secure the bit and work at controlled speeds to maintain smooth cuts. Select the bit size that matches the desired flare diameter and follow standard HVAC swaging and safety practices. This set is designed to provide reliable, accurate tube expansion for refrigeration, air conditioning, and general HVAC copper tubing work.