1-Bit API or ISO 9001 2-Bit steel tooth bit 3-Bit IADC(117-437) 4-Bit high ... storage sac, for bearing system provides good lubrication guarantee.4. Steel ball lock die, suitable for the high speed.5. The 250 ... :3,packing 4,Certificate:5,we can provide more size Steel tooth(IADC)111, 121,131117,124,126,127,136,137 ... us more good advance!!! API&ISO 8 1/2" kingdream Steel tooth tricone bit