AGPtek 12V Electric Magnetic Lock - Heavy Duty Security Door Lock for Home & Office - Ideal for Glass Doors, Gates, and Cabinets

Effective lock and well built.Uncomplete install instructions: use Allen key into holes at 4 corners to detach the fixing plate, also unscrew only one screw in the front (middle left on the picture) to remove the plate to access 12 v connectors.Works well with any 50 watt 12vDC power supply, cheaper if you only need normal regular on-off switching.