Sollroc 6 1/2 Inch M60 DTH Drill Bits For Mining

6 1/2 Inch M60 DTH Drill Bits For Mining Specification: Bit Diameter: 165mm 6 1/2'' flushing hole (No.* Button Dia.mm): 2*26 No.* Button Dia. mm: Gauge Buttons 8*18mm + Front Buttons 8*16mm Weight (kg): 24 Advantages: 1.Five basic dth drill bit designs: Flat front, Convex, Speed, Concave. All shapes for all types of rock of hard, soft or abrasive. 2.Deliver maximum energy to dth drilling bit, fast drilling speed and low air consumption due to inner structure of HD series DTH hammer designed according to newest rock drilling theory.