Guarantee a perfect flare every time by deburring the rough-cut end of the tube with this handheld metal smoothing tool. The first step to flaring a custom brake or fuel line is having perfectly clean ends before you start. With this tube deburring tool, you can clean up the inside diameter of any sized line from 1/8-inch to 1/2-inch and the outside diameter of any sized line from 5/32-inch to 9/16-inch. It has high-stretch steel cutting blades with an inner deburring blade on one end and an outer deburring slot on the other. The retractable inner blades make it safe to store in your toolbox between uses.