12v electric magnet

this reminds me of an electromagnet my dad made for me when I was 7yrs old, he took a large bolt wrapped a bunch of copper wire around the shaft, then wrapped the winding with white tape and supplied me with a 6 volt lantern battery. this kept me satisfied for a while untill I got bored with the low voltage and tried plugging it into a wall socket.....that ended my new toy...:-(