Burr (edge)
（重定向自Deburr）
![Metal burr extending beyond the edge of the cut piece, view on the cut face (top) and from the bottom (bottom)](/Images/godic/202501/08/Metal_burr1316.jpg")
A burr is a raised edge or small piece of material remaining attached to a workpiece after a modification process.
It is usually an unwanted piece of material and is removed with a deburring tool in a process called 'deburring'. Burrs are most commonly created by machining operations, such as grinding, drilling, milling, engraving or turning. It may be present in the form of a fine wire on the edge of a freshly sharpened tool or as a raised portion of a surface; this type of burr is commonly formed when a hammer strikes a surface. Deburring accounts for a significant portion of manufacturing costs.