The Hyundai DURAWING 560 is a Concentric Overburden System designed for casing of 630 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 560 is the self actuating wing bit system that works perfectly everytime.
 
Drilled Hole Diameter: 630mm
Casing Size O/D: 609.6mm
I/D: 584.2mm 
 
Major Body Diameter: 580mm
Length: 1201mm
System Open: 630mm
Casing Size: 609.6 / 584.2mm
Total Weight (approx): 1150kg
Wing Retracted: 559mm
Hammer Type: QL200,  SD18