Kutzall 1/2 x 1-1/2 in. Ball-Nose 1/4-in. Shaft Burr, Fine is designed for use with flex shaft tools, hand grinders, or any tool that accepts 1/4-inch collets or adjustable chucks. These fine ball nose burrs are versatile, allowing you to create flat surfaces, round-over edges, concave shapes with the rounded top, and radius-bottom grooves with precision. They can be easily cleaned using solvent or by burning clean with a gas torch without damaging the teeth, ensuring long-lasting performance and reliability. Model Number: BN-12X112G