Kutzall 1 x 1 in. Sphere 1/4-in. Shaft Burr, Fine is designed for use with flex shaft tools, hand grinders, and other machinery that use 1/4-inch collets or adjustable chucks. These sphere burrs are highly versatile, excelling at hollowing out areas with precision, including creating undercut or overhung edges. They are for shaping concave surfaces such as spoons and bowls. The burrs can be cleaned easily with solvent or by burning clean with a gas torch without damaging the teeth. Known for their fast stock removal and exceptional finish, these burrs resist loading, making them a reliable choice for detailed and efficient work. Model Number: S-1G