Description:6/7/8 Speed direct mount/bolt mount long cage bike Rear Derailleur Transmission for bike repairing and maintenanceHigh quality alloy steel and plastic material effectively reduces friction with chain to provide you a smooth shiftingWide connection design for precise shifting and durability and very easy to install or removingEasy to install and remove; and accurate gears provide light and stable shift performance Compatible with most 6/7/8 Speed and 11T teeth high speed chainwheel mountain bikes, road bikes and variable speed bikes etcSpecification:Material: Steel Plastic Fits for 6/7/8 SpeedSuitable for 11T teeth chainwheelPackage Includes:1 Piece Rear Derailleur