Docooler Single Door 12V Electric Magnetic Electromagnetic Lock (350LB) Holding Force for Access Control - 180KG Alluminum shell adopts high strength material, with hard anodised processing. Built-in reverse current protection device (MOV),Corrosion resistant. Fit for wooden door, metal door, glass door, fireproof door, etc.. Good quality and durable to use. Use magnetic power to lock the door, 180kgs (350lbs) holding force. .