Description of YG 1 Spotting Uncoated Straight Diameter Cutting Tools and Industrial Drill Bits
NC spotting drill. 90 Degree point angle. Made of 8 percent cobalt and high speed steel. For more precise centering work on NC/CNC machine. A larger diameter in respect to the subsequent drilling tool permit to obtain the centering and chamfering simultaneously.
Bought two, one broke on first cut in aluminium, the other held but didn't run well. I'm not sure if it's the angle of entry or what. Saves time for slotted pins, but doesn't look very pretty.
Pros
Larger diameter compared to drill tool below allows for simultaneous centering and beveling