For use with 14" by 14" square food dehydrator trays. Made specifically to work with:Excalibur Dehydrator Models: 4926T220, 4900220, 3526T,3500, 2500, 4500220, 4526T200, 3926T, 3900, 2900,  ED 600, ED 900, ED 300 and 500 series.