This is a cable port for a 102 mm large hole. If you need a different size or have other ideas for this, please leave a comment to let me know.

Design is available here: https://cad.onshape.com/documents/8b3c34c3a6b89ce8e735bc0a/w/e1d99fa1883ff372dfcc61e6/e/e2f1699a07aa797ff45f1044