Pit,
Those holes are fro machines that deliever coolant to the holders this way. If the machine doesn't have the option, it's pretty useless I believe as there is nothing that I'd want to put between the flange of the tool holder, and the spindle face!!!
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"It's only funny until some one get's hurt, and then it's just hilarious!!" Mike Patton - Faith No More Ricochet |