Kutzall Extreme 1 x 1 in. Sphere 1/4-in. Shaft Burr, Very Coarse is designed for precision and durability. These sphere burrs feature a rugged and very coarse tungsten-carbide coating, making them i for use with flex shaft tools, small rotary grinders, and other machinery that accommodate 1/4” collets or adjustable chucks. Their aggressive, razor-sharp teeth efficiently remove material with excellent control while resisting loading. for hollowing out and shaping concave surfaces such as spoons and bowls, these burrs can even create hollowed areas with undercut or overhung edges. With Kutzall Extreme Sphere Burrs, you’ll spend more time carving and less time clearing your tool. Model Number: SX-1C