... -scale construction of drilling equipment.1,ZGYX-5500 Hydraulic Rock Drill openequipped with Hydraulic Rock Breaker rail and multi-directional propulsion ... ,have a high efficiency of punching ,higher than comparable pneumatic drill car 1-1.5 times.3,low energy consumption, lower ... than comparable pneumatic Drill 1/3-2/3.4,Strong structure,Compact,through strong ...