... elastic 2.rigid 3.automatically adjustable 4.stable RUILONG rock button bit introductionTwo series of DTH bit are available: High ... -Rand. Application: earthwork and stonework construction, mining, water well drilling, construction engineering, and so on. Markets: our products are ... districts such as Australia, Canada, USA and France. RUILONG rock button bit specification NO.Diameter(mm) Tip size(mm) ...