FIT BOTH LEFT & RIGHT: Fits inside handlebar within 17.4mm ~ 22mm (inside diameter), applicable for both Left and Right. CONVEX MIRROR: Mountain bike mirror feature the convex mirror with wide field of view and is adjustable to any viewing angle. MULTI-FUNCTION: Base with full rotation and could adjust to any direction to help you watch direction of your back. Mirror with 180 Degree Plane Rotation to adjust mirror place. EASY AND DURABLE: friendly, very durable. Easy to use, Well mounted in minutes. PERFECT GIFT FOR YOUR CYCLING: Perfect for road bikes, mountain bikes, bikes, and YOUR BIKE Material:ABS colour:black Package Contents: 2 * bicycle 2 * wrenches Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.