BAZHOU Using the rubber strap the Spy mirror can quickly be attached to tube diameters. Flexible fitting strap makes it compatible with any bike including Road and Mountain bikes, can be fitted almost anywhere. Double Angle, 360 adjustment allows you to tailor the mirrors position allowing the mirror to be fitted either side of the bike. Delivery Quantity: 2pcs, Bicycle Mirror Package Contents: Only the above package contents, excluding other products. Size: mirror diameter 50MM, suitable for handlebars with a diameter of about 15-35MM (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)