... 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel box4,we can provide more size 5 ... ,124,126,127,136,137 211,311216,217, 227TCI(IADC)415,435, 417,437515,525,535,545, 517,527,537,547615 ... tell the quantity. 8 1/2 215.9mm iadc 517 water well drill bit