Features： 1、FLEXIBLE SHIFTING: Adopting 5 6 7 speed rear derailleur design to realize more flexible and smoother bike shifting. Suitable for most types of bikes, such as mountain bikes, hybrid bikes, folding bikes and so on. 2、WITH CONVERTER: Bike rear derailleur comes with a converter for easy installation and adjustment, suitable for Brompton C line single hole frame. With screws and other accessories for easy installation and fixation. 3、STABLE AND PRECISE OPERATING: The rear derailleur is designed to ensure the accuracy and stability of shifting operating. Excellent shifting performance ensures your safety and stability while riding. 4、PREMIUM MATERIAL: This bike rear derailleur is made of premium aluminum alloy and nylon materials, sturdy and reliable, not easy to deform or damage, can be used for a long time. 5、NOISE REDUCING PULLEY: 8T nylon and fiber pulley design can effectively reduce the friction noise when the chain and pulley bite together, can be removed and replaced with 10T or 12T pulley. Specification： Item Type: Bike Rear Derailleur Material: Aluminum Alloy, Nylon Application: For Brompton C Line Single Hole Frame Pulley: 8T, pulley made of nylon with fiber, effectively reducing friction noise when the chain and pulley bite Flywheel: Compatible with 11 to 28T flywheel Package List： 1 x Bike Rear Derailleur 2 x M4 Nut 2 x M4x16MM Screw 2 x M5x18MM Screw 1 x M5x6MM Screw 1 x Converter 1 x Arc Washer