1.Ovoid：suitable for very hard formations. 2.Conical3.Parabolic:used in medium-hard rock formations.4.Chisel:used for soft formations.5.Wing Tip:used in medium soft formations.6.Scoop:used in soft formations. 7.Flat8.Serrated
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1.Ovoid：suitable for very hard formations. 2.Conical3.Parabolic:used in medium-hard rock formations.4.Chisel:used for soft formations.5.Wing Tip:used in medium soft formations.6.Scoop:used in soft formations. 7.Flat8.Serrated
