The Dresco bike mirror is the solution if you have trouble looking behind you. With this Dresco mirror you can see what is happening behind you and it is safe to turn off. The mirror is mounted in the handlebar of the bike. By cutting open the side of the handlebar, you can slide the attachment into the handlebar. Then you screw the mirror into the handlebar. Fits all standard bicycle handlebars with a diameter of 19-21mm. The Dresco mirror can be mounted on the left or right side. This bike mirror is fully adjustable so you always have a good view to the rear. The mirror has a diameter of 7,5 cm.