• CNC machined 6061 aluminum
• Black anodized finish
• Includes (3) M4x8 Flat Head Screws
• Attaches to frame with (3) M4x8 Flat Head Screws
• Fasteners not included
• https://wheelsmfg.com/derailleur-hanger-57.html

Note: DROPOUT-57 mounts on the OUTSIDE of the frame dropout. DROPOUT-89 is the same shape, but mounts to the INSIDE of the frame dropout.