The VANSIHO Derailleur Hanger is a high quality replacement part for your GT, Aggressor, Avalanche, KHS, Timberline, Kestrel, Kettler, Mongoose bicycle. It is made of aluminum alloy and has a silver finish, making it durable and long lasting. The hanger is designed to fit most mountain bikes, and comes with a bolt for easy installation. It is a great upgrade for your bike, and will help improve your riding performance.