The document provides information on deep-boring tools with external coolant supply (BAT single tube and ejector double-tube method with continuous chip removal in the advance direction or in the opposite direction).
VDI 3397 Blatt 2-1994 Pflege von Kuehlschmierstoffen fuer die Metallbe- und -verarbeitung - Massnahmen zur Qualitaetserhaltung@ Abfall- und Abwasserverminderung