Note This product is a practical bicycle trailer device for traction. With full hook arm and hook joint, it is easy to install without any other tools. High quality steel ensures high durability and applicability. Mounting device can be compatible with universal bike and electric bicycle.Application to quick release or nut shaft wheel.Not applicable to disc brake. Features - mark: . - color: As shown in figure. - materials: plastic and copper. - Size: approx. 20 cm (length). - This product is a practical trailer device for traction. - the use of steel and durable, strong and durable nylon bands. - Be equipped with a complete hanging arm and hanging fitting, and easily installed without any other tools. - mounting devices can be compatible with generic bicycles and e-bikes. - for quick release or shaft nut wheels. Not applicable for disc brake. The package includes A bicycle trailer.