8pc Dual-Cut Carbide Burr Set - 1/4inch Shank Double-cut and precision-ground for vibration-free operation in your 20,000-rpm die grinder. All burrs have a 1-1/2" long, 1/4" shaft. Contents: 2 cylindrical burrs: 1/2" x 1" and 3/8" x 3/4". 2 cylindrical/radius-end burrs: 3/8" x 3/4" and 1/4" x 5/8". 2 ball burrs: 1/4" and 3/8" diameters. 2 cone/radius-end burrs: 3/8" x 3/4" and 1/2" x 1".