... bits,auger drilling bit We can offer construction conical bits for foundation drilling, rotary drilling, trenching, tunneling, mining etc, ... 40-44HRC hardness, has high toughness and wearable character. Tip is made from Low press Sintered, and Suitable Grade ... Which are to make sure the good performance during working.For Areas Using:Foundation creationSolid wallWater well drillingFor Machines :The ...