Features: Strong compatible, suitable for precise speed measurement of octagonal middle mounted motor series, providing accurate speed data with high-quality accessories, stable and reliable. Easy installation provide reliable and consistent speed measurement with durability materials, ensuring long-term use. Electric Bicycles enthusiasts, cyclists, Bicycles repair technicians, and member of professional cycling clubs. In Bicycles repair shops or workshops, as a replacement or repair accessory for the speed Sensors of the eight side central motor. Ensure the accuracy and stability of electric Bicycles speed measurement during the ride process. Specifications: Dimension:1cm/0.39in Component:abs Package Includes: 1pc Speed Sensors 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.