Thank you for viewing. This came as a set when I replaced my Fissler pressure cooker. I already have the exact same one, so I'm selling this one, which is new and unused. It can be used not only for pressure cookers but also for deep pots. The instruction manual says it can also be used as a drop lid. As shown in the image, the diameter is 19cm. Although it is new and unused, it has been stored at home, so I would appreciate it if you could understand. #Fissler