Well-made, but the photo is misleadingBought this model in part b/c it appeared to have 2 screws on the long sides (6 total) to attach to the chimney flue. However, the 8x13 size uses a single screw in the center of each side, not the 2 pictured. The cap itself appears well-made, and so far I've had at least one very breezy day and it's still in place, but I did bed it in silicone caulk in addition to using the screws, and I'm sure that helps.
by Jo