Keep track of small metal parts in your trailer and garage with this Magnetic Parts Tray. This 5" round tray mounts magnetically to your E-Track (no E-Track fittings) and holds screws, bolts, nuts, and small tools. Grab it off to use for projects and stick it back onto the E-Track "base" when you're done. No need to transfer to a toolbox. Ultra-strong magnet at the base holds up to 4 lbs. of small metal parts, no matter what position the tray is in. Mount it vertically or even upside down. Knock it over and those pesky little screws stay put. Made from long-lasting stainless steel with a non-marring rubberized magnetic base. A great addition to your E-Track organization accessories. Also ideal for mounting on toolboxes, car hoods, and any ferrous metal surface.