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

18.75 mm

19.00 mm

19.25 mm

19.05 mm