Recommend a magnetic sweeper

[treefarmerguy]

I bought mine from Northern Tool a dozen years ago or more. It's probably a foot and a half wide, maybe a bit more. It picks up everything and then some stuff that will surprise you. It's light and easy to handle, so it's been great for going over job sites. Mostly I use it in the grass around a house that I'm working on.

I second, or third, the Harbor Freight. Works great, found some things I didn't know I lost!