This SS Standard Size Universal Wood Stove Insert Adapter Box. Available In 6'', 7'', And 8'' In Flue Size Hook Up Or Flex Size. This Model Is  A 30'  Slant For Easy Hook Up. Has Side Flanges And Slots To Facilitate Top Of Stove Attachment. OA Size 14'' Wide 12'' Deep 5-1/2'' Tall. (ID Dimensions 12'' X 10'') Spot welded Construction, Type 304 Stainless Steel.