Our sleek new ultralight BM-45 barend mirror easily attaches to drop and flat bars, making it perfect for all bikes. Constructed of aluminum and glass for durability and nearly distortion-free viewing, the BM-45 represent the height of handlebar mirror construction and design. Minimal projection from the bar means never having to sacrifice clean aesthetics for critical rear-view safety again.Key Features:45mm Lens diameter.16〜25.4mm Inner diameter.35g Weight.8.5Nm Tightening torque.3mm Allen Key included.