Replaceable Derailleur Hanger / Dropout 407 Headsets featuring a deep square knob

featuring a deep square knob pattern with sufficient spacing between the tread

thanks to the precision-cut stainless steel surface

2x AAA batteries included

one too many botched jobs will mean that you need to replace your Park Tool 676 - handle weldment with arbor for BTS1

Replaceable Derailleur Hanger / Dropout 407 Headsets featuring a deep square knobUpgrade or replacement rear derailleur dropouts; stiffer and more rigid to improve shifting performance CNC machined from solid 6061 aluminium to exact tolerances Stiffer than any original equipment hanger which improves shifting performance Still breaks before your frame does to perform its main function Direct replacement for original equipment with guaranteed fit Black anodised for extra scratch and damage resistance Laser etched for easy part