... drilling or oil well drilling2,Model: various kinds and according to the requirements of customers3,Material: ally steel, tungsten carbide ... formation,very hard formation .We have different and suitable types12,Button bit: small tooth, big tooth,conical inserts,chisel inserts13,Packing ... 627,637,737512,522,532,612,622,632,7326. How to ship the bits to your country? You Satisfaction Is Our Purpose! We ...