The Great Hawk is designed for Cruising and Racing yachts up to 20m. The Great Hawk vane arm is made from the same super tough nylon and the Reference Arms are made from glassed filled nylon for ultimate rigidity and UV protection. The precision balanced vane arm and Hawks "V" Jewel bearing surface gives instant response to shifts and gusts with minimal inertia. The Reference Arms may be preset at 55, 60 or 65 degrees or any angle you prefer and can be used for either upwind or downwind angles. The 5mm Aluminum support rod is strong enough to take normal wear and tear, but can be bent straight should it be knocked while the mast is being stepped or unstopped. The Great Hawk is easily removed from its mounting bracket with one screw and the mast bracket can be mounted vertically or horizontally. Vane Arm length 38cm (15"), Overall height 29cm (11.4"), Overall weight 70 grams.