This is a standard part manufactured by Elesa & Ganter, a German-based build-to-order components supplier. The full part number, GN 148-90-M12-A-1-57, includes specific information about the product. The “GN” prefix indicates that this is a standard product made by Elesa & Ganter. The numbers following, “148-90-M12-A-1-57”, includes the components’ dimensions, thread size, material, and number of pieces in the set. Specifically, the “148” refers to the width of the unit in millimeters, “90” refers to the height, “M12” refers to the thread size (12mm), “A” indicates the material of the part, and “57” indicates the number of pieces included in a set.