chain adjuster is for those looking to upgrade their folding bikes. Its robust construction ensures long-lasting performance, while the chain guide prevents derailment. This accessory is essential for maintaining optimal chain tension, making your rides smoother and more enjoyable, especially on varied terrains. Features -Color:Red -Material:Aluminum alloy, stainless steel -Size: 11.00X2.50X2.20cm/4.32X0.98X0.86in -Compact design: lightweight and compact, ideal for folding bikes and easy storage -Enhanced performance: improves chain transmission efficiency, minimizing the chances of chain slippage -Secure riding: ensures the chain remains securely in place, enhancing rider safety -Aluminum alloy, stainless steel materials: constructed with aluminum alloy and stainless steel for -Maintenancefriendly:It's for singlespeed bikes chain adjustments and repairs Package list: 1 x Bicycle Chain Tensioner