This is a Gridfinity center drill caddy. This caddy fits one #5, #4, #3, #2, and #1 center drill.
This is the link to the center drill kit I have, and used as a reference to design my caddy
https://www.amazon.com/Anytime-Tools-Center-Countersink-Tooling/dp/B000N216SU
Center_Drills_Insert.STL | 264.4KB |