The Bird-B-Gone MMRLMNT Railing Mount works with the Repeller 360 and the Bird Spiders to attach to boat rails and other applications. The Railing Mount is easily attached to railings sizes 1” to 1.86” thick, simply tighten the screw until secure. The Railing Mount is ideal to use with the Repeller 360, Bird Spider and Bird Spider 360 to keep birds from landing on boat rails, pole fences and other applications.