6/7 speed hub bolt for mountain bike rear derailleur

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MODEL: SHIMANO TOURNEY RD-TY21B bicycle rear derailleur, compatible with 6 and 7-speed SIS index shift drivetrains.
IMPORTANT: Shimano hub bolt mount (hanger mount) rear derailleur for mountain bike, not direct mount.
EXCELLENT PERFORMANCE - Precise gears provide light and stable shifting performance and make riding easy and comfortable.
MATERIAL: Made of high quality steel materials, durable and long service life. Easy to install and remove.
APPLICATION: Suitable for MTB mountain bikes, road bikes, variable speed bikes, folding and urban bikes. They are your indispensable bicycle accessories during your cycling trip.