The full range of the Drill Bit Set makes it easier to expand HVAC tubing. It preserves copper/aluminum malleability while doing the swaging, avoiding cracks, and leakages! With this set comes the most common HVAC tubing diameters that work for both hard and soft copper standardized, easy to braze swages in one set! Featrure: Quality: Keep the coopers' malleability, which will ensure better couplings overall; the process also protects the tube from cracking. Material: Made of ball bearing steel, it is practical. The flares will always have the same size and will fit perfectly; The swages present a perfect depth and a tight-fitting, that will make the brazing easier, reducing the fatigue stress over the coupling area. Innovation: Revolutionizing system for molding tubes using heat by friction way more sur-face of contact between the flare and the Valve. Usage: Air conditioning installation, open copper tube, so that two copper tube mutual link. Specification: Product Name: 6PCS Triangular Handle Straight Mouth Pipe Expander Product specifications: 1/4, 3/8, 1/2, 5/8, 3/4, 7/8 Product material: Alloy steel Product application: Expanding tubes, reaming holes, expanding tubes, unfolding copper tubes to connect two copper tubes to each other Package Includes: 6 x Swaging Tool Note: Due to manual measurements, please allow slight measurement deviations. Due to the different display and light-ing effects, the actual color of the item may be slightly different from the color displayed in the picture.