Did you know that skier-down flags are mandatory in 15 states (and are a smart move in all 50 states)? SeaSucker's Skier Down Flag Holder is a must have to keep your skier safe in the water. It attaches with one of our 4.5" vacuum mounts, so it's easily and securely deployed on your boat or PWC. Holds poles/whips from .25" to .5" in diameter. Made for use with flags up to 20"x20". Flag and pole not included.