The set includes 6pc 1/8" Tungsten Carbide Burrs:SA-51 1/8" Cylinder SC-51 1/8" Cylinder Ball Nose SD-51 1/8" Round BallSE-51 1/8" Egg Shape SF-51 1/8" Round Nose Tree SG-51 1/8" Tree Precision cut very sharp cutting edge High quality carbide burs made in USA Will work in standard 1/8" power tools Used to grind on metal