Kutzall 1/2 x 1-1/2 In. Ball-Nose 1/4-In. Shaft Burr, Coarse is designed for use with flex shaft tools, hand grinders, or any tools that accommodate 1/4-inch collets or adjustable chucks. These coarse ball nose burrs are versatile, capable of creating flat surfaces, rounding over edges, hollowing out concave surfaces with their rounded tops, and forming 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-12X112