Ysjz6.12 Vertical Shaft Drilling Jumbo Boom Number 6 Drilling Range(mm) 1650-12000 Retracted Dimension(mm) 2250*8200 Drilling Frame Weight(Kg) 12500 Hole Diameter(mm) 45-54 Hole Depth(mm) 5100 Feed Length(mm) 6774 Working Flow 700L/Min ...