... : Alloy steel Certificated by API&ISO9001:2008 New PDC Bits for water well drilling (12-1/4") we can supply rock bits ... used in the field of mine, transportation, tunnel and hydroelectric for shelving reticular support. Model114,117,127,437,517,617,637 ... TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, directional boring, and underground ...