It's the case that even the words ‘this’ and ‘that’ must rely on some kind of descriptive content - at least for the speaker or "reference-fixer". Even if the reference-fixer doesn’t have a proper name or even an explicit description, he must still have individuated the this or the that otherwise how would he know what it is that he's in fact referring to? Which this or which that? This is certainly the case for the hearers.
“… demonstrative reference, one has reference without any description. But this is merely a myth. Suppose I point to a brown table, and say, ‘This is brown.’ It is not my pointing alone which fixes the reference of the occurrence of ‘this’, for my finger will also be pointing at the edge of the table, or a small brown patch on the table.”
“There is the question how wide an environment of the ostended point is meant to be covered by the term that is being ostensively explained…the question where one of its objects leaves off and another begins…It is meaningless to ask whether, in general, our terms ‘rabbit’, ‘rabbit part’, ‘number’, etc. really refer respectively to rabbits, rabbit parts, numbers, etc., rather than to some ingeniously permuted denotations. It is meaningless to ask this absolutely; we can meaningfully ask it only relative to some background language…Querying reference in any more absolute way would be like asking absolute position, or absolute velocity, rather than position or velocity relative to a given frame of reference.” 
Stanley, Jason. (1997) 'Names and Rigid Designation'.