This tool was designed for motorcycle roadside emergencies. I needed a tool that could fit in my pocket and tighten screws or bolts in a pinch. The "brass knuckle" design is simply for aesthetic appeal.
This multitool contains:
four hex wrench sizes (8, 10, 12, and 14mm) as well as a Phillips and Flat screwdriver.
The selection of tools is focused around metric (Japanese) motorcycles such as my 1983 Honda CB750. After finding myself in a couple of situations in which I was far from home and needed a simple screwdriver to tighten a fuel line or control, I created the concept for this small, keychain-sized multi-tool.