Features: Premium machined bicycles derailleur hanger offer universals compatibility with most bike frames,for secure drivetrain alignment and enhanced shifting precisions. Crafted from durability aluminum alloys using full milling, this design ensures hardness, deformation resistance, and polished edges for seamless chain movements and reduced wear. Ideal for mountain bikers, road cyclists, and commuters seeking reliability derailleur stability during aggressive riding or frequent gear shifts on varied terrains. Built to withstand intense trail vibrations, and long distances while maintaining reverse thread locknut integrity to preventing accidental loosening. The innovative counter clockwise threaded collar with spacer integration ensures tool without 8mm wrenches adjustments, streamlining maintenance for quick derailleur replacements or wheel removals. Specifications: Color:Four Choices Dimension:6.5×3.8cm/2.56×1.5in Component:aluminum alloys Package Includes: 1pc derailleur rear derailleur hook note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.