Drilling Diameter:36-45mm RQL-Y28 Crawler Hydraulic Rock Drill Features: 1. The RQL-Y28 crawler hydraulic rock drill is a hi-tech product driven ... , little vibration, trivial labor intensity.3. It widely applied to rock drilling of marble, granite, metal, non-metal and coal mines ... 4.2TFeed Travel 1000mmDust Collector System New Arrival RQL-Y28 Crawler Hydraulic Rock Drill,mining quarry for sale