Heads up - 65% off Halfords Industrial Tool Chest Bundle

[Sonic]

They're just stacked on-top of each other and held by gravity and friction. There's a foam matt on each shelf that they sit on which makes it pretty grippy, and a big lip so i can't see them coming off unless the bottom unit itself tips... but they are bloody heavy. It took 2 of us to lift the top unit on, and that's minus tools!

[Greg_S]

I definitely benefit from being tall with this toolbox. I may bolt the boxes together to make them a bit more secure, but I don't think they will be going anywhere once the tools are loaded in properly. Quite sturdy too