... YN27,YN27C,YN27T certificate:ISO9001,CE super air /petrol /electric rock drill from chinaFeatures 1. The ... in any place. 4. In operation, it can be handled horizontally, vertically downward, or upward at ... below 45°. When turned vertically downward, it can drill to the maxim depth of 6m. Applications1 ... concerned.2. It has far-ranging applicability and can be used in various environments such as high ...