If you like this item,please add it to your "Wish List", Thank you very much!!! ^-^5pcs Steel Rotary Burr Set 1/4'' 6mm Shank Wood Rasp Drill Bit Features: 100% Brand new and high quality!! Highest quality long lasting rotary Rasp set designed For shaping wood, plastics and light alloys 1/4'' (6mm) shank suitable for most electric & cordless drills Used for grinding, polishing, shaping & burnishing wood surfaces Includes 5 Popular Shapes: Ball, Oval, Cylinder, Large Cone, Small Cone. Specifications: Material:45# Steel Color:Black Shank diameter: 6mm Shank length: 27-40mm Total length: 50-60mm Tips Must be clamped during using.Cutting way is better with conventional milling to avoid reciprocating feeding. Prevent scraps flying at work, please use safety glasses. There are some oil on the head. Package includes: 5 x Steel Rotary Burr Hope you can have a good shopping experience.Any problem, just feel free to contact us, we will try our best to solve your problems at once.