Keep your screws, nuts and washes in check with this mini, 3” Wurktol Stainless Steel Magnetic Tray. Just stick to a metal surface (typically around the engine bay or tool box), and toss the screws from the item you are disassembling in the tray to keep them magnetized and not going anywhere. Sized perfectly for small jobs, this can be stored in any small profile toolbox drawer, your door cubby, or even glovebox.
Wurktol also offers a 6" size: