This is such a simple idea but so good! Previously I always put tools on my seat while working, not a bad option but easy to bump stuff off and lose bolts/nuts. Got this thinking it was a good idea, and couldn't be happier. tapered sides that slide over edges of seat hold really well so it is a lot more stable than i was expecting too. Wouldn't bother trying to make my own when this is so cheap anyway. Highly recommended, new favorite workshop toy!