This Thermo Scientific® ELED petri dish rack is for use with Precision® general-purpose and circulating water baths. Made of stainless steel, it holds eighty 50mm or thirty 90mm petri dishes. Measures: 9.75 x 8.75 x 6.25in. (24.8 x 22.2 x 15.9cm). Holds: 80 x 50mm or 30 x 90mm Petri Dishes. Material: Stainless Steel. Thermo Scientific® ELED #: 3166183. Thermo Scientific ELED - “Every Lab, Every Day”.