This is a simple palm held nut driver with an ergonomic star handle that I designed. I saw a similar model for metric sizes and wanted a similar product but for imperial bolts, as the work I do mostly uses imperial bolts (1/4"-20, #10-32, etc). Therefore, I designed this model, which has 4 sizes: 5/32" (#8 screw), 3/8" (#10 screw), 7/16" (1/4"-20 screw), and 1/2" (5/16" nut). I hope this design serves useful to you.

Here is a simple butterfly knife I designed for practice. I've been considering buying a real butterfly knife, and this has helped me hone my skills. It's smooth without bearings, thin, and sleek.