Edge Finder Double - GROZ
Edge and Center Finders are time saving positioning tools for use on jig boring, milling machines etc. These are used for accurately locating work edges, shoulders, grooves, center points & scribed lines.
The single-point edge finders by Groz work fine, but this one has a fatal design flaw. The .500 end is held on by some kind of friction fit to the spring, which will eventually let go when you try to offset it. While it can be fixed with some fishing line, it will come apart at the same point.
Get a single-edge finder, trying to save 5$ here isn't helping you.