These are the nastiest mirrors on the street. Overall, the mirror head is about 3 x 4 with round glass 3 in diameter. The smoothly arched stem positions the center of the mirror head about 4-3/8 above and 5-1/2 outboard of the mounting point on the handlebar control. The adjustment mechanism is unlike anything out there; the swivel ball is captured between opposing pins. The pins are threaded to allow quick and easy tension adjustment. Hardware for a variety of H-D mounting applications is included Adapter may be needed for screw-in mirrors (AC01-010). Not Recommended for Buckhorn Handlebars.