... 4.adequate stocks,fast delivery 5.IADC 437 IADC 437 9 1/2"Kingdream TCI rock drill bit sizes HAT series for ... 1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm( ... 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”) 241.3(9 1/2”),244.4(9 5/8”),250.8( ... 311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3/4”)374.6(14 3/4”)381(15”),393. ... 7(15 1/2”),406.4(16”)444.5(17 1/2”), ...