Forging Concentric DTH Drill Bit for Big Diameter Construction Anchor Drilling

Forging Concentric DTH Drill Bit for Big Diameter Construction Anchor Drilling Concentric drilling tools With casing shoe for big diameter construction anchor drilling Introduction 1.Sound drilling straightness and fast drilling speed. Theoretically, symmetric drilling makes sure the hole in all formations such as gravel bed, stright,the drilling speed fast and the drilling torque relatively small. 2.The torque necessary for symmetric drilling is much less than that for