Fits over 90% of all chimneys while costing 60% less when compared to ordering a custom made cap. Protects the entire crown and flue areas from deterioration. Knock down design saves space and shipping cost. Stainless Steel patented five piece knock down design. Features: Made in USA. Easy Storage. 100% Stainless Steel. 24 gauge removable hood. 22 gauge base and screening. No nuts or bolts slides. Simple, Sturdy Mounting System. Patented Locking Device. U.S. Pat.# 5,402,613. Lifetime Warranty. Specifications: Overall Dimensions: 16" (L) x 17" (W) . Screen to Screen Dimensions: 13" (L) x 14" (W). Standard 10" high screen. Superior 3/4" oval hole mesh prevents creosote build up.