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Was skeptical about the 1mm claim but it genuinely centers even my smallest dowel pins without fuss. Saves me a ton of time laying out holes on the drill press, no more scribbling lines and hoping for the best.

Tiny thing but it earned its spot in my drill drawer. I use it on 3D printed pulleys and acrylic discs and it centers them in seconds instead of me eyeballing with calipers. The stepped pin handles everything down to the smallest discs in my parts bin.

I was skeptical about something this simple, but it nailed the center on a 40mm aluminum disc on the first try. The stepped pin seats cleanly in the pilot hole, so I stopped eyeballing with calipers and wasting blanks. Setup takes maybe ten seconds.