... with you in the near future1, drilling class PDC: suitable for soft to hard geological drilling in ... special shape of products.3 the drill bit, Pdc applicable formation1) by a complex geological exploration ... strata, compound of large drill bit applications, such as anchor, 3 wing drill bit, etc.3) oil exploration ... .9,244,311,445 Typeall kinds and size PDC bits Applicable water well, oil field, construction, ...