A device which is used to guide cables or wires through walls. The device includes a maintaining device which is connected to two or more cable maintaining elements that surround, in a frame-like manner, a mounting area which includes a through-opening, and the cable maintaining elements are arranged in the region of the through-openings. According to this invention, the mounting area has a matrix-form and includes at least two mounting lines and at least two mounting gaps which enable the mounting area to be equipped in a simple and easy manner. The mounting lines and the mounting gaps predefine, respectively, a constant modular dimension, and the cable maintaining elements are dimensioned with respect to the width and the longitudinal extension in the direction of the mounting line and direction of the mounting gap, so that the width and the length correspond to a multiple whole number of the modular dimension.