A tool, a device, and a method for drilling capable of very easily forming a hole part in a drilled matter by extremely smoothly discharging chips produced at drilled positions so as to maintain an excellent drilling efficiency. By using a drilling tool having a shaft with a spiral groove part formed...http://www.google.de/patents/US7131795?utm_source=gb-gplus-sharePatent US7131795 - Tool device, and method for drilling
