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Small: If you only have household compost, this is good for quickly getting the job done. 1/4" Galvanized screen.
Large: This unit is almost 5' long (The frame is 4') and can be used on a table or the ground. It weighs 15 lbs and is easy to carry anywhere. It has a 1/4" galvanized screen to separate the castings out from the compost. The majority of your redworms and the large debris comes out the other end to go back to the compost or to share with friends. This is perfect for the home compost enthusiast.