What is the typical shape of the effective tip of a nut driver?

The effective tip of a nut driver is typically hexagonal. This shape allows the tool to fit securely onto the flat sides of a hex nut, providing the necessary grip and torque required to turn the fastener effectively. The hexagonal design minimizes the risk of slipping and ensures that the maximum amount of surface area of the nut is engaged, facilitating better control when tightening or loosening nuts.

Other shapes like round, square, or flat do not provide the same level of contact and grip on hex nuts, which can lead to inefficient use or damage to the nut or the tool itself. Hex nuts are specifically designed to be turned with a hexagonal socket, making this design essential for proper tool functionality.