... IADC 437 IADC 437 9 1/2"Kingdream TCI rock drill bit sizes HAT series for water well 1.Introduction about ... bits, steel tooth bits, insert tooth bits, roller bits, drill bits, drilling tools etc. we have been in line with ... meet your special need. 3.Sizes and types of drill bits we can privide: 60mm,65mm,76mm,93mm,95mm, ... show IADC 437 9 1/2"Kingdream TCI rock drill bit sizes HAT series for water well