Foundation drilling tools,Rotary Drilling bits,Trenching bits,Tunneling tools,Rock drilling ,auger bits,auger drilling bit Physical Description:Steel Body, made by material 40Cr or 42CrMo, heat treatment with 40-44HRC hardness, has high toughness and wearable character. Tip is made from Low press Sintered, and Suitable Grade Selected according to the Target Projects, Which are to make sure the ...
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