Product  description:

The HD30  is made for general excavations, quarrying and bolting with hexagonal shank rods with  a shank size of 108mm(41/2")*22mm(7/8"). The HD30 can use water  flushing or air flushing. 
 HD30 is  a hydraulic rock drill to drill diameter 32mm(1¼") to 50mm(2") holes.