The Porthole die was designed with an island scene in the center that cuts out for use either with the porthole, or with another project. It's like a 2-in-1 die. The porthole itself measures 2.9" x 2.75" with an opening of 1.55". It can be used to create shaker cards, frame a small photo or sentiment, etc. The scene inside is also interchangeable with the Porthole Scenes die set (FRA-DIE-10847) or the the scene inside the Steampunk Periscope (FRA-DIE-10848), giving you a choice of 4 ocean views!