Electromagnet, Solenoid, Air Core Coil manufacturer / supplier in China, offering 400n Holding Force 24V DC Electromagnetic Door Holder for Fire Door Magnetic Retainer Mx5025, 500kg Electro Permanent Magnetic Chuck for CNC Milling Machine Metal Workholding, Landa Mx5027 Electromagnetic Lock 12V 24V DC Electric Lock 45kg Force Keyless Smart Lock for Fireproof Door and so on.