Construction and durability Made from hardened carbon steel with a robust hexagonal shank design to maintain structural integrity under torsion. Black oxide finish protects surface durability for prolonged tool life and repeat use. Accurate sizing options for reliable results Includes six industrystandard sizes ranging from 1/4 (6.3 mm) to 7/8 (22.2 mm). Calibrated sizing ensures accurate pipe expansion for seamless refrigerant line connections. Graduated markings enable quick depth verification during operation. Enhanced operational control for consistent swaging Hexagonal base securely locks into standard power tool chucks for reliable engagement. Stabilised rotation prevents bit slippage during pipe expansion. Optimized flute geometry reduces metaltometal friction and minimises vibration for consistent results on copper tubing. Efficient workflow integration for faster, easier work Precisely angled cutting edges create smooth flare transitions. Singlepass expansion capability saves workshop time. Ergonomic weight distribution reduces operator fatigue. Suitable for both professional technicians and enthusiasts. Use scenarios HVAC refrigerant line installation on copper tubing in service calls, delivering reliable, leak flares with quick setup. Workshop fabrication or of refrigerant lines where speed and accuracy are important, benefiting from singlepass expansion. Training or hobbyist projects using standard power tool chucks due to the secure hex shank and easy handling.