Strainer for coin tumbling?

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I am looking for a strainer that I can use so it will strain out my coins but allow my tumbler rocks (aquarium gravel) to go though. Since a dime is .70" it would need to be something with holes smaller than that, perhaps 1/2". Does anyone have any recommendations? I have been searching Amazon but I don't see a strainer with big holes in it, just curious how you all separate your rocks from coins after tumbling.

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I found I was searching for the wrong thing. "Classifier" or "Sieve" is what I needed to search for, and I see many 1/2" ones, so I think I will try that. Kellyco has a basic Garrett Sieve for only $7.95, which looks to be about 1/2"