Holding the tablet in portrait mode, there's a rounded metal portion on the bottom and top edges. (pocket-lint.com)
Another important safety precaution is to attach the negative jumper cable for the dead battery to an unpainted metal portion of the car frame, rather than to the negative battery post. (mechanics.stackexchange.com)
I am working on roof colors and thinking granite for metal portion and Certainteed Landmark Colonial Slate for the shingles. (homebunch.com)