We ve taken your run-of-the-mill skull & added 35% more angst & 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 4-3/8 above & 5-1/2 outboard of the mounting point on the handlebar control. Mirror Mounts (above) required for installation.