1. : The bicycle chain tightener is made of high-strength aluminum alloy with design, wear- and anti-. 2. Bright Color: Not easy to fade, more beautiful. Effectively prevent the chain from falling off the frame and damaging the frame . 3. Applicable To: The split zipper adopts CNC technology, which is mainly used to adjust the chain tightness for folding bicycles. 4. Easy to Install: Easy to install without complicated tools. Suitable for road bicycles. Colour:Red Material:Aluminum Alloy Package Contents: 1 x Bicycle Chain 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.