Dear customer, if you have any questions after receiving the goods, please feel free to contact us. We will handle it as soon as possible. Thank you for your support. Description: [Function]:This meter wheel with synchronous wheel is designed for accurate length and distance measurement. [Material]:Made of high quality pp,ensuring durability and long time performance. [Product Size]:The meter wheel has a diameter of 95.5mm,circumference 300mm and a hole diameter of 6mm or 8mm,making it suitable for various applications. [Packaging]:Each package includes 1 piece of the meter wheel,providing convenience for your needs. [Versatile Usage]:This meter wheel can be used in various industries such as construction,engineering,and manufacturing for precise measurement purposes. Specifications: Material:pp Size: diameter:9.55cm/3.76inch hole diameter:0.6cm/0.24inch or 0.8cm/0.31inch(Optional) circumference:30cm/11.81inch Note: Please allow slightly errors due to manual measurement and different monitors. Package included: 1 Piece Encoder meter wheel