For optimal use on dinghies and flag poles, consider the Small Allen Aerovane with mast mount. Made of slightly flexible plastic, the mast mount collar is versatile and can be attached to a wide range of spar diameters. To attach to the mast, use the elastic loop and stopper ball provided. The built-in counterweight ensures accurate indication of apparent wind angle and prevents "flapping" in strong winds. Designed to be easily readable without causing unnecessary drag, this Aerovane can be assembled by pushing firmly onto the rod until it clicks. To remove, simply pull with force from the rod.