The SEPA-1 from Burr King contains 4 screens that are a one piece design and made from durable high impact polymer for manually sifting parts from media. 

The SEPA-1 kit also includes the a bucket.

Great for separating undersize media from useable media.

Kit contains SEP6 (1/4"), SEP7 (3/8"), SEP8 (9/16"), SEP9 (3/4") and 3317 bucket.

Screen measures 13 3/4" inches diameter by 5 1/4" inches depth and neatly nest inside of each other for easy storage.  Screen tappers down to 11" and fits most 5 gallon buckets.