Abstract: An adjustable clamp for holding objects securely in position comprising at least one arm (1) which exhibits one articulated arrangement (4, 5) arranged at each of the two ends of the arm. The articulated arrangement exhibits two pivot pins (6, 8, 7, 9) arranged at an angle to each other. The object (36) is held securely by a clamping arrangement attached to the articulated arrangement. Each articulated device (4, 5) exhibits, free to move in relation to the arm (1), an articulated body (15) with a curved articulated surface (16) which is in contact with and is so arranged as to move relative to a corresponding curved articulated surface (17) in an articulated component (12) attached to the ends (2, 3) of the arm. The articulated body also exhibits a flat articulated surface (18) which is contact with and may be turned relative to a corresponding flat surface.