... after-sales service 4.adequate stocks,fast delivery 5.IADC 437 IADC 437 9 1/2"Kingdream TCI rock drill bit sizes HAT ... ,118mm,120mm,127mm(5”)130.1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm(5 7/8”)152 ... .3(9 1/2”),244.4(9 5/8”),250.8(9 7/8”)269.8(10 5/8”),295.3(11 5/8”)311.1(12 1/4 ... ”),346.0 (13 5 ...