18" x 18" Stainless Steel Cap - SS1818u Vacu-Stack Chimney Caps for Wind Problems It will not harm metal

It will not harm metal

Stock base widths are 9

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*Stands on two stable legs that hold screen tight against fireplace

*Includes drill bit and masonry tapcon screws for easy installation

18" x 18" Stainless Steel Cap - SS1818u Vacu-Stack Chimney Caps for Wind Problems It will not harm metal*Lid size is 23" x 23" and is made from strong 24 gauge 100% stainless steel *Outside base size is ACTUALLY 19" X 19" and is made with 18 guage 100% stainless steel *Set screws are 2" long and adjust to fit the different variations in flue sizes *Fits any outside tile dimensions between 16" x 16" to 19" x 19" *Base is designed to fit square, round, rectangular or oval flue tiles *Screen is 8" high and has a 3 4" mesh screen *Made in the USA and