Consist of a purpose designed cast matrix head to which PDC inserts have been fixed in a pattern PDC bits have proved successfully in soft to medium hard consolidated formations. They are used in coal mining exploration and for opening hole drilling the interested project.    
 
Standard size: AQ, BQ, NQ, HQ, PQ, BQ3, NQ3, HQ3, PQ3, NQ2, T2 76, T2 86, T2 101, T6 86, T6 101, T6 131, T6 146 and required by you availablely.