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Lengthens your existing hanger 21 mm for use with larger rear cogs Fits all standard mount hangers 42t max rear cog in a 1x setup 40t max cog w/Shimano or Campy standard mount derailleurs 40t max cog w/SRAM derailleur when used with double or triple ring crankset 36t max when used with Campagnolo crankset CNC machined 6061 aluminum Includes steel fixing bolt Red anodized finish