Between flutes
Between the lands
Between web
Neck diameter
59 Degree
118 Degree
27.5 Degree
8 Degree to 12 Degree
Face
Flute
Heel
Cutting edge
Used for hard material
Used for high carbon steel
Used for soft and tough material
Used for normal low carbon steel
Unequal point thinning
Drill point not in centre
Clearance angle is incorrect
Drill cutting edges are not sharp