These clips were better than those sold in big stores. These were easier to use and made of what appeared to be higher quality stainless steel due to their shiny look and tough feel. They opened/closed easily and provided a secure fit when tightened onto semi-rigid bathroom fan ducts. I've used them in combination with duct sealant or mastic, a goo that fills any space between the duct material and the part you attach the duct to.
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