Shimano Deore RD-M6000-GS Rear Derailleur - 10 Speed, Medium Cage, Black measuring-tool Extra-wide bar clamp for increased

Extra-wide bar clamp for increased stiffness

5mm allen to install

It's a stack spacer

Handle: Plastic

Shimano Deore RD-M6000-GS Rear Derailleur - 10 Speed, Medium Cage, Black measuring-tool Extra-wide bar clamp for increasedThe Shimano Deore M6000 rear derailleur is designed for aggressive trail riding and uses SHIMANO SHADOW RD PLUS technology for improved chain stability and retention. For 2x10 setups Features the Shadow RD+ chain stabilizer system to minimize chain slap Utilizes Shadow RD Plus offers a quieter drivetrain and reduces chain slap Shadow RD Plus provides a simple solution for chain drop and is lighter and efficient that roller type chain devices Optislick