Features: Craft from high strength aluminum alloy, this folding bike chain tensioner ensures durability and light weight performances, maintaining its shape over prolonged use. Features a precisions chain adjustment, it effectively maintains chain tension to prevent derailment, making it great for various bikes and single speed bicycles. Great for bike cyclists, single speed enthusiasts, city commuters, and bicycles maintenance aficionados seek safe chain stability. Perfect for city commuting, casual ridings in street or country side, cycling event, and long distances travel, ensuring ridings by preventing chain slacks. Its small size designs allows for easy installation without professional tool, making it a essential accessory for enhancing your cycling experience. Specifications: Materials: Aluminum Alloy Color: Black/Redness/Golden/Silver Package Weight: approx.20g Size: As The Picture Shows Package Includes: 1 Set of Bike Chain Tensione note: Please allow 1-3mm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!