Versatile Compatibility: This resistance adjustment knob is designed as a versatile accessory for bikes, ensuring it fits seamlessly with models to enhance your workout experience Material: The resistance adjustment knob crafted from pp, this knob offers durability and , making it a reliable component for your fitness equipment Compact Size: With a convenient size of 21.5cm/8.46inch, this adjustment knob is easy to handle and install, providing control over your bike's resistance settings Enhanced Workout Control: Fine tune the resistance levels on your bike effortlessly with this adjustment feature, helping you achieve optimal workout intensity tailored to your fitness goals Easy to install: The knob is easy to use and quick to install, it not take up too much time , and it is very convenient Size Chart:21.5cm/8.46inch Color:Black Material:plastic Package Contents: 1 * Adjuster Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.