This is the Cateye Left Side Bar End Mirror.
This mirror attaches to the end of a mountain bike bar or straight bar.
Not for use on road drop bars.
Heavy-duty design is light and fully adjustable
The scratch-resistant mirror has a wide angle for easy viewing and is easy to install. 
SPECIFICATION
Recommended use
Commuter
Mount
Bar-end
Removable
 -
Weight
 -