air /petrol /electric rock drill from china type:YT24,YT28,YN30,YN30A,YN30E,YN27,YN27C ... the main engine weighing only 30kg. It is suited to work on high mountains, and places with no ... especially suits the temporary projects that the machine has to be carried at any time and in any place ... below 45°. When turned vertically downward, it can drill to the maxim depth of 6m. Applications1. The machine is ...