... foundation hole-forming equipment. SQR15-25 Series Rotary Drill rigChassis & EngineAdopt rotary drilling ... sufficient burning, to achieve strong power output with low fuel consumption, low emissions ... dusty with automatic defrosting, shockproof and sound-proof, tridimensional blowing-in, wide open, safety ... used for the clay bed, gravel bed, pebble bed and rock formation with a certain weathering degree ...