The Hyundai DURAWING 147 is a Concentric Overburden System designed for casing of 192 mm diameter holes through varying formations into bed rock.
The wing bits are enclosed making them the most professional & efficient system on the market today as they are not exposed to "clogging" in loose overburden material while drilling down to the bedrock.
When the drilling starts, the bit wings protude utilising a unique cam sliding mechanism. The key feature of the DURAWING 147 is the self actuating wing bit system that works perfectly everytime.
Drilled Hole Diameter: 192mm
Casing Size O/D: 185mm
I/D: 158mm
Major Body Diameter: 157mm
Length:
System Open: 192mm
Casing Size: 158 / 185mm
Total Weight (approx):
Hammer Type: QL50, DHD350, SD5, M50, Mach 50, MC55