6.35mm

1. 5Pcs Set of heavy duty and durable rotary burr set that includes 5 popular shapes: ball, oval, cylinder, large tree, small tree.
2. Fits all drills. A perfect tool addition to helping you finish your job clean, fast and easy!
3. This will be a great tool for sculptors. This is commonly used for grinding, polishing, carving, and furnishing wood surfaces.
4. It is perfect for the low hardness of the workpiece, such as softwood and plastic. In a great part of the work, it can replace the petiole small wheel, and no dust pollution.5.
5. Made of Hardened and tempered, high carbon steel construction for longer life and effective cutting.
6. Precision machined cutting teeth. This has 1/4" shanks to fit all electric and cordless drills.