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1. Fail secure, NO mode (Locked when power is removed) 2. Suitable for wooden door, glass door, metal door, fireproof door 3. Holding force: 500kg / 1100 pounds 4. Safety function: built-in voltage spike suppressor 5. It's a solenoid with one function, can be wired any way. With two contacts and no polarity requirement. (The lock will have polarity when a diode added.), Weight: 0.38 Pounds, Manufacturer: OBO HANDS