Earl's new 37° flaring tool is a professional aircraft grade impact tool that works on all tubing materials. This tool is made from forged & hardened steel components and is used with a bench vice & hammer. Once the tube is installed in tool, the flare is easily formed with a few sharp hammer blows. Most other lower cost tools distort the tube, or break when working with harder materials like steel & stainless steel, not the Earl's Ultimate 37° flaring tool!