It is a holder for 15mm Euro perforated walls, so you can hang Ryobi One + 18 V batteries on the perforated wall.

The 4 flat pins must be inserted into the holder at a 45° angle. It is ideal to insert the pen into the holder from behind with the 45° slanted side.

The pins are difficult to get in but you don't need any glue.

The pins are pushed in until they are flush with the front.

I printed it with PLA CF.