Quality Material: This Mountain Bike Crankset is made of premium aluminum alloy, enhancing the rigidity of the crank and reducing its weight. It's designed to withstand the rigors of mountain biking and other demanding cycling activities Size & Chainring Combination: The crank arm length is 170 mm/6.69 inch, with a chainring combination of 42-34-24T, making it suitable for 8/9 speed bike. It also fits a standard pedal size of 9/16 inch Versatile Use: This crankset is not only great for mountain bikes but also ideal for Road Bikes, Folding Bikes, ensuring wide applicability Maintenance Reminder: To ensure optimal performance and security, please regularly check the stability of the screws as loose screws can easily cause product sliding wire Package Includes: Each package comes with a complete set including left crankarm, right crankarm and chainring - everything you need to upgrade or replace your bike's existing crankset Specification: Material: Aluminum Alloy Package Includes: 1 Bicycle Crankset Note: Please allow slightly errors 1-2cm differences due to manual measurement.