Guizhou Sinodrills Equipment Co., LTD

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4 wings step drag bits 4 wings step drag bits 4 wings step drag bits are one piece construction of alloy steel cast with tungsten...
4 wings chevron drag bits 4 wings chevron drag bits 4 wings chevron drag bits are one piece construction of alloy steel...
Claw bits Claw bits Claw bit offers rapid penetration, drilling speed asfaster than that of a drag bit...
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