... , highly effective pile foundation hole-forming equipment. Rotary Drilling Rig SQR22Multi-purpose rotary drilling rig of Shangqi Heavy Industry is a hi-tech ... , attachment could be short twist drills, universal drilling bucket, sand bucket, used for the clay bed, gravel bed, pebble ... cabin with air condition and dust prevention may be used for windy and dusty with automatic defrosting, shockproof and ...