Features: Constructed of premium aluminum alloy, sturdy, high durability. Be able to lift rear mirror by 3cm and extends it up to 4cm (the maximum extending distance of two rearview mirrors is 8cm). Effectively prevent riders form blocking the view of the rearview mirror, help broaden the viewing range of the motorcycle (or electric bicycle). If users need to extend wider distance, 10mm and 8mm two sizes can be used in combination (6cm rising height, outward extending distance up to 8cm). Simple installation process, practical and convenient to use. Suitable for most motorcycles and electric vehicles whose rearview mirrors are with M10 or M8 mounting apertures. Specification: Material: Aluminum alloy Main Color: Black Thread Diameter: 10mm(M10), 8mm(M8) Extended Horizontal Distance: 4cm Risen Vertical Distance: 3cm Package Weight: Approx.106g/3.7oz Package List: 2 * Mirror Adapter 2 * M10/10mm Screw 2 * M10/10mm Gasket 2 * M8/8mm Screw 2 * M8/8mm Gasket .