Indexable Insert Drills Series 336/337 generation of the KAISER insert drills have straight flutes. This design guarantees a short distance for chip evacuation and high radial and torsional rigidity. Series 336 with through the tool coolant, directed on both sides at the cutting edges will guarantee optimum cooling and chip evacuation. The 337 drills are suitable for drilling under extreme conditions such as inclined surfaces, semi-circle bores and transverse bores. Made of case hardened steel construction for maximum rigidity and toughness.