The Mirrycle mounts in minutes with the wrench that is included.
 
The mirror is 7.5cm (3-inch) round, convex glass mirror with a wide field of view and is adjustable to any viewing angle.
 
Fits inside handlebars with 13.75mm - 22.5mm (.54" to .875") inside diameters.
Suitable for most electric bikes and regular bicycle brands, note you may need to cut a hole in the grip to fit.
Made in the USA.
 
 
Fits steel or alloy handlebars.