MirFlex Tough Flexible Bicycle Rear View Mirror Adjustable Tilt Safety Equipment Fits Most Standard Size Mountain Bike Handlebars Model: HANDLEBAR MOUNT can be used on the left or right side of the handlebars to view traffic behind DURABLE PLASTIC BODY handles the toughest trails without breaking FULLY ADJUSTABLE flexi-mount fits most standard mountain bikes and cruisers, can be turned in any EASY INSTALLATION with a Philips head screw driver is the only tool you will need to mount your LARGE SIZE measures approximately 9.25 inches from top to bottom with 3 inch oval mirror