I am a handyman. The first thing I take with me for car repairs is the flexible ABN shell. I put the tray back in place before loosening the first screw so I don't lose anything. It works great. Also, if another mechanic comes to the rescue, he doesn't have to ask where the parts are, he just looks for the tray. Believe it or not, I haven't lost a single screw or washer since using this tray. This is just a wonderful tool that will always be in your toolbox.