Cobra Carbide 10399 Micro Grain Solid Carbide Cylindrical Burr with Radius End, Double Cut, Shape C SC-42, 1/8" Shank Diameter, 1/8" Head Diameter, 9/16" Cutting Length (Pack of 1) Solid carbide tools offer long tool life and faster cutting speeds than other substrates, but are more brittle and must be used with rigid toolholding systems Slight left hand cutting action gives excellent control of the burr and grinder Round shanks allow use with a wide variety of toolholding systems Double-cut style has rows of cutting teeth cut in two intersecting directions for fast material removal and a rougher finish Permits faster penetration and material removal rates, due to the chisel edge; reduced pull improves control and reduces operator fatigue