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Hole Opening

On-Bit GunDRILL Reamer

PDC cutting structure on all blades of the backreaming end provide maximum number of PDCs for best backreaming performance even in tough conditions.

Flat TCIs on a longer crown enhance vibrations damping thru better gauge holding capability. TCI protrusion provides reaming action with the PDCs.

PDC cutting structure on alternating blades at forward reaming end backs up the bit in achieving desired hole size. Cutting structure starts above body diameter and extends to tool gauge diameter.

Blade offset on bit side improves TFA locally to allow a smooth flow path from bit junk slots to GDR junk slots.