100 mm x 15 mm Petri Dish, sterile, vented cover. Note: 100 mm x 15 mm are nominal values. They are normally in the range of 92-93 mm. It is the norm in the biotech industry. Just like 2x4 lumber in HomeDepot, they are actually closer to 1 1⁄2 inches by 3 1⁄2 inches.
EZ Bioresearch Sterile 100 mm X 15 mm Petri Dish with Lid vented 2 x Pack of 10 - B01ARAZQM4