This 1200LBS Holding Force electric magnetic lock 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. NC Mode (Fail-Safe Mode): The door will be closed when power is on; when power off, the door will open. It is suitable for wooden door, glass door, metal door, fire-proof door, Cabinet, etc. Specification: Electromagnetic plate Material: Aluminum Alloy + Metal Plate Armature Plate Material: Zinc Cover Finish: Anodized aluminum Color: Silver Holding Force: 1200LBS/500KG Input Voltage: DC 12V Operating Temperature: -10C to +55C (14 to 131F) Operating Current: 480mA Size: 10.43L x 2.95W x 1.54H (inch)/ 265L x 75W x 39H (mm) Armature plate: 7.28L x 2.36W x 0.51H (inch)/ 185L x 60W x 13H (mm) Package Weight: Approx. 9.5lb (4.27KG) Package list: 1 * Electromagnetic Lock 1 * Armature Plate 1 * Screws Pack 1 * User Manual (English)