I bought 6 of these trays in 4 months. I have 2 each (metric and standard) in sizes 1/2", 3/8" and 1/4". The magnets are strong enough with a full tray so you can turn it upside down and shake it , without them The 2 smaller sizes (1/4" and 3/8") have a large magnet on the back that keeps them at the bottom of your toolbox drawer.
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