I learned about the Robert Larson 800-2875 Plastic Center Finder (Amazon link) from maker Ben Light, who uses it to drill out the center in the tin can robots he builds. Online, I see a lot of videos of jewelry designers using these. Woodworkers use them on finding centers on dowels or centering up work to chuck into a lathe.

They also work for finding the center of squares. Using the side with the 90-degree angle you can mark out the center of a square. This is especially useful on smaller material (like small tiles where a speed square isn’t as helpful.

The smaller, 60-degree angle on one side of the tool is intended for use finding the center of hexagon shaped material. I’ve yet to come across any hexagons I need centered, but I can imagine it being useful around a geodesic dome build.

I also have to just say that this is one of those tools that I simply find aesthetically satisfying. I probably only break it out every couple months, but every time it catches my eye it makes me smile.

If you want to pick one up for yourself, using the above Amazon link helps support my videos and the Cool Tools blog.