compatible: 280-350-500 electromagnet series | "U" for mounting the counter plate on outward opening glass doors
compatible: YM-500 and SM-500 series | "I" for mounting the counterplate on the doorframe
compatible: YM-500N(LED) | "L" for mounting the magnet on the frame in case of outward opening doors
compatible: YM-500N(LED) | "ZL" for mounting the magnet and counter plate on inward opening doors