... resistance. Features of 537 TCI Tricone Bits:The 537 features aggressive chisel tungsten carbide inserts on the heel rows ... 110-40principal character of the cutting structurePartial roof scoop type inner row of teeth,The outer row is ... can supply rock bits, tricone bits, steel PDC bits, drill bits, TCI bits,drilling bits, oilfield bits, steel tooth bits,drag bits, hammer bits, well bits and so on ...