... as limestone, dolomite,chert and hard sandstone,etc.Large radius conical compacts in inner row,spherical compacts in crest and outer ... stringers,such as limestone,hard sandy mudstone and sandstone,etc.Conical compacts in inner row,spherical compacts in outer row.0 ... strength and abrasiveness,such as limestone,dolomite and sandstone,etc.Conical compacts in inner row,spherical compacts in outer row.0 ...