T38 Thread Symmetrix DTH Drilling System , Crown Drill Bits Casing 89mm

Detailed Product Description Thread: T38 Code No.: RoBit-SOD 89 Casing O.D.: 89mm Wall Thickness: 4-8 Mm Ring Bit O.D.: 95-99mm Type: ATLAS-SOD 76/89 T38 thread Symmetrix system permanent casing 89mm for top hammer;Concentric Overburden Casing Drilling System Description Symmetric/Centrex/Symmitrix Drilling System Symmetric is a concentric drilling system with retrievable pilot bits. Permanent Model The ring bit will be left in the hole after drilling finished. This system