... body,pdc cutters8,Certification: API9,Applicable of: petroleum&gas,water well and mining10,Bearing sealed: metal sealed(HJ) ... rubber sealed(HA) not sealed(W)11,Formation: soft formation, soft to medium hard formation, ... )Type tricone bits,steel tooth bits, PDC bitsApplicable water well,oil field, construction, geothermal, directional boring ... 8”)269.8(10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346. ...