Feature●Our part # YG1-10006●YG1 cobalt NC spotting drills with 90-degree & 120-degree angle●Dimensions: 5/16" diameter (D1), 0.984" flute length (L1) and 3.11" overall length (L2)●Application: For more precise centering work on NC/CNC machines. A larger diameter in respect to the subsequent drilling tool permit to obtain the centering and chamfering simultaneouslyDescription YG1 NC Spotting Drill 8% Cobalt HSS 5/16" 90 & 120 Degree 2 Pc Set CNC Machine