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Description about sell rock bits, tricone bits, drill bits, TCI bits, drilling bits, oilfield bits, steel tooth bits, Drag bits, hammer bits, well bits, and oilfield equipment and so on. Drilling bits and PDC bits which used on the oilfield and water well, the sizes: 5 7/8"***7 1/2"(both insert drill bits and steel tooth bit). Accord with API 5D latest edition Steel Grade: E**5, X**5, G***5, S***5 O. D. Range from 2"(*0.3mm) to 6"(**8.3mm) Type: Internal Upset, External Upset, Internal and External Upset. With competitive price and high quality. If you are interested in our products , please feel free to contact with me.