Smooth down edges of your woodworking project or round out the ends of sharp, unfinished piping and rebar with the ABN 13 to 36mm Deburring Tool Drill Attachment. Burr file drill bit works with round bars, nuts, and bolts so your clothing and hands are protected from many types of jagged edges. 0.9-inch (2.3cm) long external deburr bit that attaches to drill has a 1.3-inch (3.3cm) top that helps protect your hands and makes a smoother finished product. For optimal performance, use pipe deburring bit with a 0-150RPM drill or air tool (not included) on the lowest setting and apply slight pressure in a clockwise direction. Firmly place your project before using bolt tapering tool. Smooth jagged edges on projects such as pipes, hoses, and ducts with burr drill bit. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.