1.certified by API-ISO 2.good quality,low price 3.good after ... 4.adequate stocks,fast delivery 5.IADC 447-837 API Kingdream Brand New Rolling bearing steel tooth rock rock ... ,,617,627,637,737512,522,532,612,622,632,732Bearing Type:HJ(metal sealed journal bearing) HA (rubber sealed journal ... T/T, L/C at sight, western unionProducts show API Kingdream Brand New Rolling bearing steel tooth rock rock bits