For handlebars with a diameter of about 15-35mm, it can also be installed on the handlebars and the handlebars. The glass piece is a wide-angle convex mirror with a wider field of view and moderate deformation. 3D adjusts the axial direction. In theory, there is no blind spot in the mirror reflection light. However, if it is installed in the middle of the handlebar, the body or arm may block the line of sight when riding. Bring it, no need to look back at the road surface, provide the personality and practical rear view program for the majority of riders. Can be used on the left or right side without the need to distinguish the side when installing. Specification: Size:14x8cm. Product Name: Bicycle Rearview Mirror. Product material: ABS plastic. Colour: Black Applicable size: Suitable for 15-35mm. Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 Pair * Bicycle handlebar rearview mirror.