Features: Consist of high-strengths aluminum alloys component, ensures long-terms use without deformation. The special square hole interfaces have strong compatibility with most mountain bike, with simple and stable installation, enhancing cycling safety. Effectively transmitting cycling power, and providing cyclists with a better cycling experiences. Compared to traditional cranks, the weight is reduced, making the entire vehicle lighter and improving cycling flexibility and handling. Adapt to different cycling postures, reduce leg fatigue, and improve comfort. Specifications: Shaft distance: 17cm/6.69in, Diameter of protective plate: 17.8cm/7in Component:aluminum alloys Package Includes: 1Set Bike Crankset note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.