This is a cap drill.
It is from the shrine of Prahesi, El-‘Amarna (Akhetaten). Stoneworkers and carpenters used drills to make holes. They used a stone cap drill like this to push down on the drill as they turned it using a bow, which gave weight to the drilling and a cushion for the driller’s hand. This is a cap drill. It is made from limestone. We do not know how old this object is.