... to establishing relationships with you in the near future 1,Structure features:1) Material: 15CrNi4MO2) Rubber/metal sealed bearing3) Jeurnal ... medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel ... 10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 5/8”),349.2( ... ,635,,617,627,637,737512,522,532,612,622,632,7326,Payment termsT/T and L/C are acceptable ...