... dolomite,chert and hard sandstone,etc.Large radius conical compacts in inner row,spherical compacts in crest ... abrasiveness,such as limestone,dolomite and sandstone,etc.Conical compacts in inner row,spherical compacts in outer ... can make the diamater size of the rock bits as cutomers request.the diamater size show in ... see other details: Available IADC code of rock bits Milled tooth:116,117,126,127,136,137 ...