The NSYAMRD50357SB is a Symmetrical DIN Rail, set of 10, symmetrical DIN. This SBM-series rail comes with self-tapping screw mounting support and compatible with SBM box, SBMC box, SBMB box and 1 rail device composition. Can be fixed by screw, screw type 5mm diameter self-tapping screws, rear of enclosure location.