フラットドリルａｄｆは、ねじれがそこまで強くないのに、なぜ刃先の切れ味がよいのか？ | オーエスジー

Flat drill ADF doesn't twist that strongly, so why does the cutting edge have a good sharpness?

In order to ensure sharpness, it is common to strengthen the twist angle and sharpen the cutting edge.

The ADF series does this with a unique cutting edge shape.