Abstract: This invention is directed to an external fracture immobilization splint for fractured bones comprising a connecting rod and two clamping heads, wherein each clamping head slidably holds at a mutual angle two or more bone pins, and comprises two parts, each of which contains a guide opening for each bone pin held by the clamping head, said parts being mutually movable in a direction at an angle to the length of the bone pins, an immobilization member being arranged between said parts of the clamping head to move said parts mutually, said bone pins limiting said movement of said parts of the clamping head by contacting the walls of said guide openings and thus being simultaneously secured in the clamping head, the guide openings for the bone pins being arranged so that, when viewed along the axis of the clamping head vertical to the fractured bone, each of the bone pins appears tangential to a mutually connecting circle in a plane perpendicular to the vertical axis.