I might have got it wrong, but this thing figured it out pretty early. I only drilled a few minutes at a time, using water to lubricate and taking breaks until it cooled. As you can see from the shaft, it is completely bare.
Pros
Strong and Durable ----- Strong M2 high-speed construction for added strength, virtually unbreakable compared to traditional drill bits, unique three-way shank eliminates chuck slippage and reduces shock; It is recommended to lubricate the bits with oil before each use to maximize bit life.