This derailleur hanger is specifically designed for use with Specialized road bikes and is optimized for compatibility with 28T cassettes. Revision 3 refers to the latest version of this hanger, which likely includes improvements to the design or material over previous versions. Made from alloy, this part provides durability and resistance to impact, helping maintain the alignment of the rear derailleur while protecting your bike frame from damage during riding Features Specifically designed for Specialized road bikes with 28T cassettes, ensuring the proper fit for consistent and reliable shifting performance. Durable Alloy Construction Revision 3 Update Easy Installation Protection for Frame and Drivetrain Additional Info Country of Origin: taiwan Imported By: BOTS Cycling Pvt. Ltd , 291 , 10 Main , 5 Block , Jayanagar , Bangalore - 560041 karnataka , India. Net Quantity: 1N Customer Care Address: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com Commodity: Derailleur Hanger & Dropouts