UPDATE: I changed my rating from three stars to five stars because seller contacted me to offer a full refund. I don't think you can top that when it comes to wanting to make a customer happy. And I didn't complain to them; they reached out to me, apparently after they saw my review. My original comments below still stand -- it's a solid product, just won't accommodate longer tools. Ironically, I purchased a similar product from this seller that includes longer bins after I received this product and saw the bins were too short -- so the seller does offer a version with longer bins; just be careful when you browse and make sure you get the one with longer bins if you want to organize tools. I've added a photo that shows the biggest bin in the first group I bought (orange 9") on top of the biggest bin in the second group I bought (black 12") so you can see the difference. The product works well, as long as you have the right bins for your needs. Original review below:This is a useful, affordable product, but I am disappointed with two aspects of it. First, the lips to connect with other trays are only on one side, and I naively thought they would be offered on two sides, to maximize connections. Second, the maximum tray length is 9" which is too short to accommodate a lot of longer tools. This product gives you a zillion tiny square trays, which I guess is great if you have a lot of small widgets, but for tools it's not the best.