Select the appropriate steel chisel

1. cone steel chisel （Characteristics:the energy provided will have a very marvellous penetration when through point,split power being transmitted around no reverse)

2.Flat steel chisel（Characteristics：excellent split power,good penetration, torque will have a direct role in the rock)

3.blunt steel chisel (Characteristics：the energy provided by a large surface, the best crushing effect,no torque occurs at fixed pin)