The steamer is 9"x 9"x13" with three trays two squares in each tray it is all stainless steel except for the outside hinge. its plain steel. after about twenty years of use I had the trays Teflon coated for easier clean up. stainless steel shelving. a small hasp on the door. door is not tight so no pressure build up and the steam can escape. my buddy build this one for me. his is about the same size with four trays and a very tight door. so he just drilled six holes in the top for steam. I just do cheeseburgers in mine it can be used for many things. a good sharp Cheddar is Kraft white in the green wrapper or Vermont Cabot sharp white is what I use. the combo of the burger cooking in its on juice and you can not over cook it using steam and a little oil from both the meat and cheese on the bun is sooooo good.