I created this drop ceiling pass-through to enable us to hang a sensory swing for our kids but protect the drop ceiling we have. Let me know if you need a different size.

Two pieces thread together to prevent it for falling out.

Designed for a drop ceiling but should also work for 1/2"-3/4" drywall as well.

Dimensions are listed below.

Internal hole diameter = 122.5mm just under 5" External diameter = 130mm (5.11inches) just over 5"

Use a 5" hole saw and ream it out to get a nice snug fit.

Designed for a ceiling thickness of ~16mm (~5/8")