This VANSIHO bike derailleur hanger is made of high-quality aluminum alloy, which is strong and durable, and has a good bearing capacity. It is suitable for cyclocross, hybrid, mountain, and road racing bikes, and can be used for derailleur hangers for MTB, road bike, BMX, cruiser, touring bike, fixed gear bike, etc. The package includes 2 pieces of derailleur hangers, which are enough for your replacement or spare use. The derailleur hanger is designed with an adjustable height, which can be adjusted according to the height of the bike frame, making it more convenient to install and use. It is a great choice for bike lovers.