This replacement derailleur hanger 663 is CNC machined from 6061 aluminum in our Colorado shop to exacting tolerances. It features a black anodized finish, attaches with one M3x15mm flat head screw and custom locknut, M12x1.0 double lead thru axle thread, and is compatible with Look part #00023431 frames. Note: Derailleur Hanger 662 has M12x1.0 single lead threads — verify your axle thread before ordering.
