... gas, water exploration, grouting and blasting in tunnels. Hole size: 65-90mm, 90-120mm All kinds of ... MKQJ 120/40 coal mine underground DTH drill rig features light in weight, easily transported, strong ... MINING PRODUCTS, the drill rigs are applicable for drilling holes in underground coal mines. Performance parameters ItemModelMKQJ90 ... DHD hammer and bit)375kg590kg Underground Anchor Hole Drill Rig