... ,low price 3.good after-sales service 4.adequate stocks,fast delivery 5.IADC 447 12 1/2" IADC 447 Kingdream rock bit ... ,118mm,120mm,127mm(5”)130.1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8 ... .8(10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3 ... Terms:T/T, L/C at sight, western unionProducts show 12 1/2" IADC 447 Kingdream rock bit international HAS series for ...