118° General Purpose, Bright Excellent general use drill bit Flutes are precision ground for faster, more efficient chip removal Industrial-Grade M7 High Speed Steel (HSS)   118° General Purpose, Surface Treated Surface Treated for corrosion resistance and increased lubricity Oil treated finish ideal for drilling various types of metals Industrial-Grade M7 High Speed Steel (HSS)   135° Heavy-Duty, Surface Treated Surface Treated for corrosion resistance and increased lubricity Oil treated finish ideal for drilling various types of metals Split Point prevents “walking of the bit” Industrial-Grade M7 High Speed Steel (HSS)   135° Premium M42 Cobalt Produced from M42 HSS Superior red hardness for high temperature applications New 135° Split Point for fast penetration and longer bit life   135° Heavy-Duty, Titanium Coated Superior performance in high speed machining applications Precision Flute for faster, more efficient chip removal Super hard surface with high lubricity extending the life of the tool Industrial-Grade M7 High Speed Steel (HSS)   6" & 12" Aircraft Drills   Screw Machine