... helicopter enthusiast, All sizes and IADC codes of drill bits are available. Special requirements of different models can be customized. Reaming shell ... and abrasive to consolidated and non-abrasive. As this kind of reaming shell is physically longer than the standard type, it ... . Size Available: "Q" Series: AQ, BQ, NQ, HQ, PQ (Front end & Back end Type) T Series: T36, T46, T56, T66, T76, T86 WF ...