I purchased this cookie sheet for use in my Krups 6 slice toaster oven. I measured to make sure a 9 by 12 inch would fit... it would. When my cookie sheet arrived I was REALLY disappointed to find that 9x12 was the INSIDE measurement - outide was closer to 10x13 and just a little too big to fit. (no where in the product description did I see the actual outside dimensions)I've given it 2 stars because I was pleased with the overall quality of the cookie sheet. If it fits your oven you won't be disappointed, as for me - I'm still looking.