Weve taken your runofthemill skull and added 35 more angst and 20 more anguish to make these 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 438 above and 512 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 HD mounting applications is included. Metric mirror adapters sold separately.