This is a round plate accessory for a Rinnai model RSR-S15C gas convection oven. It came with the convection oven when purchased in 2024. Diameter: Approximately 23cm, Height: Approximately 2.3cm Although unused, it has been washed once with detergent. As shown in the third photo, there are a few bumps. Photos 4 through 6 are from the instruction manual. The instruction manual is not included. According to the manual, the Rinnai oven plate handle (part code 537-0074000) is required to remove this round plate from the oven, so please be aware of this.