They are made of elephant ivory, now very decayed; they are very fragile. On the curving narrow face of both is the beginning of a Htp di nzwt formula (not in the photo), while on the opposite face of one is the longer text shown here, and on the top of the other the shorter text.
I wish to thank René van Walsem of Leiden University for suggesting the following interpretation of these objects in June 1999.
The first text reads: nw n Ab wr HkAw rn.f, 'an adze of ivory whose name is wr HkAw', and the second nw imy-wt, 'an adze (called) imy-wt'. It would appear that both texts give names of adzes used in the Opening of the Mouth ritual, and they appear in a list on a relief from the late 18th dynasty tomb of Merymery at Saqqara, now in Leiden (Inv. AP.6). As the objects we have found are made of ivory, perhaps they are real implements which were buried with the deceased, or perhaps used in the burial ritual and then forgotten and left in the burial chamber? No parallels to them are known, which renders a precise explanation of their form and presence here uncertain.
The two other adjacent photos show other angles taken in 1999. The upper shows a fragment of the curved back of one adze, and the other the profile of one of the heads. You can see that they do (with imagination) look like the hieroglyph .