Electromagnet, Solenoid, Air Core Coil manufacturer / supplier in China, offering 450n Holding Force 24V DC Electromagnetic Door Holder for Fire Door Magnetic Retainer Mx5025, Well-Perform Landa Mx5027 Magnetic Door Stopper Lock 450n for Fire Door Locker, DC 12V/24V 400n Electromagnetic Lock Magnetic Door Lock for Access Control System Security Door and so on.