This Fish Tail biface represents a product made by a highly skilled craftsman. It was made at a time when stone tool making in Egypt had reached a golden age of flintknapping. It dates to sometime during the Naqada I period to the beginning of the Naqada II period between 6,000 and 5,500 years ago. These earlier types have smooth curving concave edges on their working ends and rounded or blunted points on their hafted ends. The edges are also concave. Some examples are reported to have been steeply beveled on both edges, near the end, for hafting. It measures 4 1/2 inches (11.4cm) long, 2 15/16 inches (7.5cm) wide and 3/16 of an inch (5mm) thick.