1.8 5/8'' 219.1mm SKH437 TCI tricone rock bit 2.material:tungsten carbide 3.colour:golden 4.high ... and impact resistance. Detailed Product Description:Bit size8 5/8'' 219.1mmIADCSKH116,SKH126,SKH136,SKH216,SKH137,SKH217,SKH437,SKH517 ... 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 ...