We call them Magnum because of their rugged & beefed up looks. Featuring sturdy stems & an oversized adjuster ball. Available in two head sizes: 5" x 2-5/8" & 5-1/2" x 3". Magnum Mirrors have a beautiful chrome-plating & a style all their own. Hardware for a variety of H-D mounting applications is included. Mirror Adapters (P/N 1445, 1446, or 1458) required for installation on Metric Bikes.