Our lab frequently needs petri dishes with holes of varying sizes. We make them by using flame-heated cork borers. The trick is to get it hot enough to burn a hole as you quickly punch out the hole. (Don't burn your hand.) We tried drilling, but shattered too many even using a special bit. If the edges are rough, we use a Dremmel tool to do a quick touch-up. As for attaching things, we use a hot glue gun. We rarely need them sterilized. But when we do, we either bleach or use UV depending on the intended use. I hope this helps. Wendy Jones Univ. of Hawaii Dept. of Entomology
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