"No escape" food bowls have a lip on the inner top ring, so when grubs make it to the top, they fall right back down into the dish again. And did we mention they're made of high-quality ceramic.
Small Size: 2.76" diameter (small dubia, small size worms, bsf,
Medium Size: 3.82" diameter (medium dubia, medium/large worms, bsf)
Large Size: 5.12" Diameter (large dubia, medium/large worms, bsf)