... .High efficiency 5.Long service life A,DP Anchor drill bits is introduced,Product name specificationsModelCoupling DimensionnoteDP Anchor drill bits27 DPM14 ... *T16DPT16 B,DP Anchor drill bitsillustration,C,DP Anchor drill bits product features and use,1. High strength2.Toughness good3.wearability4 ...