... and hydropower, railway tunnel, highway construction and other industries.Concave type tungsten alloy matrix body bit features:PDC Bit with Arc Angle ... geological exploration, coal mining, mining, water conservancy, water and electricity industries.Models:Φ56mm、Φ60mm、Φ65mm、Φ75mm、Φ94mm、Φ113mm、Φ133mm、Φ152mmRemarks:We ...