[Wide Compatibility]Clockwise threaded screws consist of 2 X 8mm and 2 X 10mm, while reverse threaded screws consist of 1 X 8mm and 1 X 10mm. Our motorcycle rearview mirrors are compatible with for Z650, Z900, Z1000/for , Tuoye V4/1290, Super / 200, 250, 390, 690, 790/for MT-07, etc. Please refer to the product details page for specific model years. [Aerodynamic Design]It is a wing when closed and a rearview mirror when open. The aerodynamic rearview mirror enhances the appearance of the horizontal design, and its 25° wing angle relative to the ground gives it a linear appearance, ensuring downforce is generated to improve the motorcycle's grip and handling, especially at high speeds. Suitable for most models with mounting holes on the front windshield. Please check whether the hole spacing is appropriate before purchasing. [Design]: When the rearview mirror is not needed, it can be turned into a wind wing to increase downforce, keep the body stable, and make the motorcycle look