The NiteRider® Double Taillight Seat Post Mount allows for the installation of 2 NiteRider® taillights. It attaches securely with the clamp mount and rubber shims for that perfect fit. Fits seat posts with a 22mm-34.9mm diameter. It features a quick release tab on each mounting point that allows you to remove just your taillight, leaving the whole mount installed on the seat post; ideal for when you leave your bike unattended or when it’s time for a recharge.