152.4mm Three Cone Bits

6"(152.4mm) IADC537 Three Cone Bits for Deep Well Drilling 1>6"(152.4mm) is a regular size in deep well drilling like oil and gas well drilling, and it is also a regular size in horizontal directional pilot hole drilling. 2>We have two types of tricone bit according to grades of bearing , one is Elastomer sealed bearing with normal quality and price, another is Metal-face sealed bearing with higher performance and price. 3>For very deep well drilling, we recommend Metal-face