Pull-out shelf for attachment to the front 19" profile rails, gray This device base is designed exclusively for mounting on the front 483 mm (19") profile rails. This means that the installation is no longer dependent on the distance between the front and rear profiles. It is ideal for all 19" cabinets from a depth of 450 mm. Thanks to the pull-out function, you have quick access at all times, regardless of whether the cabinet is free-standing or hanging on the wall. The robust steel construction ensures a high load-bearing capacity.