Abstract: A dart has a body with a cavity at one end. A collar screwed into the cavity retains the head of a dart point within the cavity; the head of the dart point being able to move longitudinally within the cavity. The collar has fingers, which extend into the cavity, and which, in a first extended position of the dart point, grip a projection from, or a groove in, the dart point and maintains the body and the dart point in a relatively fixed relationship, whilst in a second position in which the dart point is withdrawn in the cavity allow the body and the dart point to rotate relative to one another.