Bird Spider provides effective bird control with multiple mounting options. Bird-B-Gone has improved the design of their Bird Spider by adding a spinning motion thats effective at deterring birds from landing and causing damage to your boat, rooftop, lights, signs and more. The entire spider rotates in a circle while the rustproof, Type 316 stainless steel arms” with scuff-preventing polycarbonate tips move with the breeze. Easy to install and maintain and will not harm people or birds.Mounting OptionsBird Spider comes ready for permanent mounting, with #10 screws included. If desired, Bird Spider can be used with the optional Portable Sandbag Base (Model 7313307) or with the optional Rail Mount (Model 12868329). The Sandbag Base enables placement on canvas T-tops or other locations not suitable for permanent mounting. The Rail Mount fits to most railings and other surfaces that will accept a C-clamp. Key Features Rotating action helps to deter Gulls, Crows, Pigeons, Cormorants, Raptors and others Can be hard-mounted with a quick release feature with mount and fasteners included or weighted or clamped using optional mounts 316 Stainless steel arms are corrosion resistant and will not leave rust stains Polycarbonate tips protect deck, canvas, and surrounding areas from stainless steel arms Available in 4' and 8' diameters for a variety of applications Made in U.S.A. Instructions