A holder including a holding body configured for displaceable attachment to a rod and including a rod passage opening for the rod, and a clamping unit movable between a clamp position and an enable position. The 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. An operating unit is provided for user-operated moving of the clamping unit between the clamp position and the enable position. The clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a plurality of wrap springs disposed adjacent to each other in a longitudinal axis direction of the rod passage opening, each spring wrapping around the rod passage opening over more than 180°, and/or a wrap spring wrapping around the rod passage opening over more than 360°, wherein the respective 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.