Roller Cone Bits For Sale, Rock Roller Drill Bits ...
Roller Bit. GREAT has customized manufacture several types of roller bit. Our roller cone drill bit includes the 90 ° U-shaped Roller Bit series and the 120 ° U-shaped Roller Bit series. All these two types have designed Starry Sky Roller Bit. The cones are designed with more full insert than the traditional tricone bit …
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