Kutzall 1/4 x 1/2 in. Ball-Nose 1/8-in. Shaft Burr, Coarse is designed for use with flex shaft tools, hand grinders, or any tool compatible with 1/8-inch collets or adjustable chucks. These coarse ball nose burrs are versatile, capable of producing flat surfaces, rounding over edges, creating concave shapes with their rounded tops, and carving radius-bottom grooves. They are easy to maintain, as they can be cleaned with solvent or even burned clean with a gas torch without damaging the teeth, ensuring long-lasting performance. Model Number: BN-14-E