Feature: The mid-section fine-tuning screw is CNC machined from ultra-light aluminum alloy, with anodized for and bright colors. The internal threads are fine and coated with lubricating grease, making the adjustment smooth and not jerky. Effectively adjust the front and rear derailleur shifting to solve problems such as skipped gears and inability to shift. Specification: Product Name: Middle section fine adjustment screw Model: TJ02 Material: aluminum alloy Size: as shown in the picture Applicable: road bikes & mountain bikes (4mm shifting/4.5mm braided shifting) Color: black, red Weight; 4g/piece Package Content： 2*Middle section fine adjustment screw Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Compatibility - 2x Road Bike Shifter Adjustable Screws Cables Line Parts Shift Connector Good Performance Materials - These bike accessories are made of premium material, ensuring their durability and long-lasting performance. Optimal Performance - These accessories offer versatility and adaptability to different cycling needs and provide optimal performance and reliable functionality enhance the riding experience and ensure safety. Easy Installation - These accessories can be easily installed on your bike to get your bike running again. After-sale Serive - We provide high quality products, if there is any problem with our product, please contact us.