Kutzall 3/4 x 1-1/8 in. Ball-Nose 1/4-in. Shaft Burr, Fine is designed for use with flex shaft tools, hand grinders, or other tools that accommodate 1/4-inch collets or adjustable chucks. These fine ball nose burrs are versatile, capable of creating flat surfaces, rounding over edges, forming concave shapes with their rounded tops, and carving radius-bottom grooves. They can be easily cleaned using solvent or by burning off residue with a gas torch without damaging the teeth, ensuring long-lasting performance and reliability. Model Number: BN-34G