A self-centering punch, with a centre punch point at one end, designed to slide down a tube or sleeve which has a cone- or bell-shaped mouth. With the bell mouth placed directly over the end of a rod, the centre of the rod can be accurately marked with the punch, provided that the end of the rod is itself square to the rod's axis and the axis of the bell punch is correctly in line with the axis of the rod. Bell punches are available in various sizes and are used to center-punch a rod prior to turning it between male centres in a lathe. Some bell punches have the centre punch fitted with a return spring.