Trex is a popular brand that’s part of Mobil Corporation. Known for its outdoor decking solutions and related materials, Trex sells adjustable aluminum gates and some composite options (in addition to the railing and other needs). You can find their products from Wayfair, Lowe’s, and some specialty stores, like Decks Direct. They usually sell their hardware kits separately, but the good news is that they can be customized and cut to size as needed. While I love that most Trex gates come with a warranty, I also think some of their gates are not as high quality as some other brands.