Check the listing for details. Champion Burr But SD-1TN D/C. Condition: New – Open box. Listed at 18.99 USD. The Champion Burr But SD-1TN D/C is a metalworking supply specifically designed for CNC machining and manufacturing. This product falls under the category of abrasives, which are used to remove excess material from surfaces. The Champion brand is known for quality and durability, making this burr a reliable choice for metalworking applications.