Rod-mountable holder comprising - a holding body configured for displaceable attachment to a rod and including a rod passage opening for the rod, - a clamping unit movable between a clamp position and an enable position, which clamping unit, in case of the holding body attached to the rod, in the enable position is capable of enabling a shifting movement of the holding body along the rod and in the clamp position is capable of exerting a clamping force to block a shifting movement of the holding body along the rod, and - an operating unit for user-operated moving of the clamping unit between the clamp position and the enable position thereof, characterized in that - the clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a plurality of wrap springs (7 1, 7 2, 7 3) disposed adjacent to each other in a longitudinal axis direction (L S) of the rod passage opening, each spring wrapping around the rod passage opening over more than 180°,wherein the respective wrap spring (7 1, 7 2, 7 3) is movable by the operating unit between a constricting condition providing the clamp position of the clamping unit and an enlarging condition providing the enable position of the clamping unit, and/or - the clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a wrap spring wrapping around the rod passage opening over more than 360°, wherein the wrap spring is movable by the operating unit between a constricting condition providing the clamp position of the clamping unit and an enlarging condition providing the enable position of the clamping unit, and the operating unit is a push button unit including a push button acting on the wrap spring unit or is a rotary knob unit including a rotary knob acting on the wrap spring unit, wherein the push button is arranged to be movable with a radial main directional component (Tk) in relation to the respective wrap spring and a push button toggle lever coupling or a push button slotted guide mechanism is provided for translating the movement of the push button to a spreading movement of the ends of the respective wrap spring with a tangential main directional component in relation to the respective wrap spring, or wherein the rotary knob is mounted to be movable with a radial main directional component (Dk) in relation to the respective wrap spring about a rotational axis (D A) and a rotary knob slotted guide mechanism is provided for translating the rotational movement of the rotary knob to a spreading movement of the ends of the respective wrap spring with a tangential main directional component in relation to the respective wrap spring. - a holding body configured for displaceable attachment to a rod and including a rod passage opening for the rod, - a clamping unit movable between a clamp position and an enable position, which clamping unit, in case of the holding body attached to the rod, in the enable position is capable of enabling a shifting movement of the holding body along the rod and in the clamp position is capable of exerting a clamping force to block a shifting movement of the holding body along the rod, and - an operating unit for user-operated moving of the clamping unit between the clamp position and the enable position thereof, characterized in that - the clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a plurality of wrap springs (7 1, 7 2, 7 3) disposed adjacent to each other in a longitudinal axis direction (L S) of the rod passage opening, each spring wrapping around the rod passage opening over more than 180°,wherein the respective wrap spring (7 1, 7 2, 7 3) is movable by the operating unit between a constricting condition providing the clamp position of the clamping unit and an enlarging condition providing the enable position of the clamping unit, and/or - the clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a wrap spring wrapping around the rod passage opening over more than 360°, wherein the wrap spring is movable by the operating unit between a constricting condition providing the clamp position of the clamping unit and an enlarging condition providing the enable position of the clamping unit, and the operating unit is a push button unit including a push button acting on the wrap spring unit or is a rotary knob unit including a rotary knob acting on the wrap spring unit, wherein the push button is arranged to be movable with a radial main directional component (Tk) in relation to the respective wrap spring and a push button toggle lever coupling or a push button slotted guide mechanism is provided for translating the movement of the push button to a spreading movement of the ends of the respective wrap spring with a tangential main directional component in relation to the respective wrap spring, or wherein the rotary knob is mounted to be movable with a radial main directional component (Dk) in relation to the respective wrap spring about a rotational axis (D A) and a rotary knob slotted guide mechanism is provided for translating the rotational movement of the rotary knob to a spreading movement of the ends of the respective wrap spring with a tangential main directional component in relation to the respective wrap spring.