... steel box4,we can provide more size 5,size and model we can provide 60mm,65mm,76mm,93mm,95mm,98mm(3 ... (20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124,126,127,136,137 211 ... inquiry1)the size of the tricone bit.2)the IADC tooth model,like 537G3)plz tell the drilling information of the layer ...