DURATECH Tubing Flaring Tool Kit, 45° Eccentric Cone Flaring Tool with Clutch, 7 Dies for 3/16 â to 3/4 â Copper, Aluminum, and Brass Tubing, for HVAC, Refrigerator Repair and Handmade. â Uniform Flaring: The eccentric cone reduces friction scratches and prevent pipe deformation during the flaring process, forming a smooth 45-degree arc.