I used it for 06-04 firings and sitter (cones) work fine. With kiln I have added 4 1/2 shelves with posts, glazes, cones, stains..etc all you'll need to have fun. 17 1/2 " diameter and 18" inches deep inside.
Handy to use for bisque ware and comes with a metal stand with legs to keep it off floor and easy to load. With stand it's 29" tall.