These are full custom made low profile skillets with flat beveled inner tops sharp 90° right angle joints. They have a 20mm ID with 2.5mm thick walls resulting in a 25mm OD. The bucket walls are about 40mm tall and sit on a 3mm dish. The bottom of the bucket sits perpendicular to the midway point on the scientific joint. The Pukinbeagle 20mm Inserts are designed to fit perfectly in these skillets. Please contact me if you have any questions!