ado-susドリルの油穴形状　φ６超え　一般的な油穴形状とかなり異なるが、何が違う？ | オーエスジー

The oil hole shape of the ADO-SUS drill exceeds φ6 and is quite different from the general oil hole shape, but what is the difference? 

It is a new type of oil hole called MEGA COOLER. Compared to the general specifications, it has a discharge rate of more than 30%, and is highly effective in removing cutting heat and discharging chips.