DUST FREE CORE DRILLINGDUDCC FOR RIG BASED DRILLING OF HEAVY DUTY MATERIALS INCLUDING REINFORCED CONCRETE10mm Roof Top SegmemtsUse With Range Of Duro Dust Free ProductsAll Sizes Direct Fit To DD62 Drill MotorExtensions AvailableLaser Welded300mm LengthBack End: 32 & 42 - 1/2" BSP (M), All Other Sizes: 1 1/4" UNC