These Hansen bowls are a bit bulky so I wouldn't recommend using a full or overcrowded toolbox. They feel like they should be 1/2 inch their price but they work for what I use them for. I bought 1/2" drive bays and a 3/8" metric drive and this is the only bay. I'm giving it 4 stars because my 1/4" flat head didn't fit her post. I took a razor and shaved the side of the post but now it won't be as strong. Overall that did what I needed and my tool box looks organized!