I went to Home Depot and bought the Husky 30-piece set just for the adapter. It solves some problems I had before. It's very hard to find precision bits in the 1/4 size. For a long time I had to use some cut-out dollar store precision bits. This adapter lets me use some high-quality precision bits I already have. Precision bits are smaller and thus take up less space than the 1/4 bits. Much thanks to the OP for the idea. As mentioned earlier, I carry a main driver. The adapter was bought specifically for it. The adapter allows for the use of 3 precision bits. I also have an extension in the set. Without the extension I can carry 5 more bits. But without the extension, some work is difficult to do. With the extension the job is a lot easier. My little pen screw driver set is now complete with enough bits to work on from door locks to electrical switches to watches, etc. Thanks for the adapter idea.