... 116,217,437,517,537,617 4.oil,water well Mill tooth Tricone ROCK Bit -TCI ... limestone, dolomite,chert and hard sandstone,etc.Large radius conical compacts in inner row,spherical compacts ... as shale,clay,sandstone and soft limestone,etc.Large radius offset crested scoop compacts in inner ... soft limestone,sandstone and dolomite with stringers,etc.Large radius offset crested scoop compacts in inner row ...