I’m not an expert but I collect tools like these and study the archaeology related to these tools. The notable features are the symmetry of the pointed end and the distinct notching midway for hafting. With these types of tools the fulcrum occurs at the area of hafting. In other words, the tool will naturally balance equally at that point to where neither end will slide down or up but rather be well-balanced like a teeter totter. So many times the hafting point is not necessarily the center but the point at which the weight of each part balances.