These blind-spot mirrors clamp to 10-12 mm mirror stems for a compact, sturdy and versatile mount. Attached where you need them to keep scan distance minimal these aluminum booted-linkages are rigid for unsurpassed clarity. Stainless steel fasteners and aircraft-style locking nuts provide quick-secure attachment and attest our attention to detail. Money back guarantee. Note: A quantity of 1 = a left/right pair. The clamp body is available only in silver and not black as shown in photo.