A simple 4x5 Gridfinity insert for the amazing Corner Jig (https://makerworld.com/en/models/410156?from=search#profileId-312113). It's a tighter fit by design as I carry my tools/jigs within a systainer. To use it one-handed/loosen the fit just increase the dimensions of the x/y axis by 0.2% for the different inserts.

The insert can only handle either the radius or chamfer inserts.