Walker CER20 Electromagnetic Lifting Magnets, 10,500 lb Capacity, 120V On/Off
A 120V AC unit that provides a without needing an external DC converter. It is available at Zoro for $318.99. buy strong electromagnet
Specialized for security, this lock provides for metal or fire-proof doors. It can be found on eBay for approximately $53. Compact & Hobbyist Electromagnets (Lower Capacity) Walker CER20 Electromagnetic Lifting Magnets