Flat Face:

Face slots help eliminate bit plugging in softer zones.More carbide to surface contact for better rock fracture.It ia a simple and arobust design,well suited for medium to hard rock formation.

Concave Bit:

Suitable to drill in all formations.Cone shaped depression in face has centering effect for straighter holes. Well suited for soft to medium hard formations.

Convex Bit:

 Fast penetration rates,Face design allows for increased body support for gauge carbide.There are two gauges and the inner gauge row helps to protect the outer row from excessive wear.