Overview: This item is magnetic lock that consists of an electromagnet and an armature plate used for access control door locks. By attaching this to the door frame and the armature plate to the door, a current passing through the electromagnet attracts the armature plate, holding the access control door lock shut. When power off, the door will open. It is suitable for wooden door, glass door, metal door, fire-proof door,etc. Features: 500KG/1200lbs magnetic lock for door access control systemSecure NC mode: unlocked when power off, locked when power on Power supply: DC12/24V; holding force: 500KG/1200lbsHigh quality and durable in performanceSuitable for: wooden door, glass door, metal door, fire-proof door Easy installation Low energy consumption (DC 12/24V ) Silent and continuous duty operation Applicable to wide variety of swing and sliding door Interface seamlessly to controller readers Instantaneous release in the event of emergency Specifications: Locking Mode: NC Working Voltage: DC 12/24V Material: Aluminum alloy shell + iron plate Holding Force: 500KG/1200lbs Lock Size: Approx. 26.7*7.8*4cm/8.5*6.2*1in Plate Size: Approx. 18.5*6*1cm/7.3*2.4*2.6in Package Information: Package Size: Approx. 28*8.1*7.5cm/11*3.2*3in Package Weight: Approx. 4300g/9.5lb Package List: 1* Magnetic Door Lock 1* Package of Mounting Screws 1* User Manual