Brand new with high quality Material:Aluminium Alloy Model: Aluminum alloy/mid-range speed change/fine adjustment screw Color:Red/Black/Blue/Gold/Titanium/Green/Silver Length:About 32mm Fit for 4mm/4.5mm outside diameter derailleur line Quantity:1pc Function: suitable for mountain bikes/road bikes, manual transmission line pipe middle leather fine-tuning screw/fine-tuning device, to improve and enhance the smoothness of derailleur/easy feel/sensitivity. Features: The mid-section fine-tuning screws are processed by ultra-lightweight aluminum alloy CNC, the surface is anodized, the colors are bright, the internal threads are fine, and the grease is coated to adjust the smoothness and not jerky. Effectively adjust the forward and backward derailleur speed to solve problems such as jumping gears and inability to change speed. Illustrate: 1. The adjustment screw installed in the middle section of the line tube is a boon to riders who are not able to install the tail adjustment screw at the derailleur Cable Connector finger and brake handle. 2. After pulling out the cable core, cut it at any position in the middle of the wire tube (of course, for the convenience of adjustment, it is recommended that the cutting position be near the car faucet), install the wire tube caps at both ends (need to be purchased separately), and insert this adjusting screw. 3. Mountain bikes, BMXs, and road bikes can all be installed! Package Include: 1pc MTB Bike Derailleur Cable Adjustable Screws Notice: 1.1cm=10mm=0.39inch. 2.Please allow 1-2mm error due to manual measurement and make sure you do not mind before ordering. 3.Please understand that colors may exist chromatic aberration as the different placement of pictures.