80 Pc 1/16 to 3/4 High Temp Silicone Rubber Tapered Plug Kit - Powder Coating Custom Painting Supplies

I use these for plugging screw holes when media blasting firearms for refinishing. They are definitely worth getting.

Great for substitute gas can spout lids, etc. etc etc. Always keep a supply on hand

These are fantastic for masking holes when painting, capping off tubes to prevent debris ingress, plugging the drain hole in a bird bath, etc. Multiple uses.

I got these because of a mud dauber problem, they will fill any small hole outside with mud and dirt. These work great for plugging hoses and fittings to prevent this. I also do sandblasting and finishing work sometimes and they are great for protecting holes from sand and paint.