... Drill Bit/ TCI tricone bit/ Milled tooth bit for drilling hole 1. Bit cones (segment) are spited from tricone bits ... 617, 637 TypeTri-cone bits, Steel tooth bits, PDC bits Applicablewater well, oil field, construction, geothermal, directional boring, and underground foundation work ... contact me,thanks.Sunny different diameter of Hole opener/ Bit cones/ Assembly Drill Bit/ TCI tricone bit/ Milled tooth ...