This is a support for electronic board "Raspberry cascade expansion board" (https://fr.aliexpress.com/item/32912551788.html?spm=a2g0s.9042311.0.0.4afa6c37f42qQS)

To save as much space as possible above the board, the design of the DIN rail fixing is made with screws and nuts.

M3 nuts shall placed into the 2 pockets
You will also need 2 M3x12 screws.

Creality

Ender 3

No

Yes

200

20