Nicely made but I don't think it was ever tested. Passes ultra fine sand nicely. Does not pass fine sand very well. Overall diameter is just too small to fit in a standard 5 gallon pail. Opening is almost as large as my sandblast funnel but it has no pilot to hold it in place. Therefore you need a second person to hold the funnel and sifter aligned. Or a second person to hold the sifter up from a pail when using it.