Detent hinging allows for added clearance in tight conditions and reduces width for bike storage or transfer. Patented aerodynamic design with anodized aluminum housing. Unique variable height/width multi-position mounting system. CNC-machined from 6061 T-6 billet aluminum. Automotive-quality convex mirror glass. Stainless steel hardware. Universal 7/8″ O.D. steel and aluminum handlebar internal adapter. Made in the U.S.A..