Kupo's Metal Pump Suction Cups offer a temporary solid light mounting solution on smooth, nonporous surfaces. They are great for mounting small lights, cameras, grip gear, and accessories to windows, mirrors, automobiles, boats and more. This 4.5in pump suction cup comes with a 3/8in-16 thread x 5/8in length stud for use with ballhead camera mounts. Provides a great mounting solution for small lights, a video camera or sound recording equipment. Features include a metal pump specifically designed to enhance suction power and durability as well as a red-line indicator to also warn of any vacuum loss due to challenging shooting conditions. There are also six 3/8in female threaded holes on this suction cups casting allowing for any additional mounting options. Perfect for mounting a ballhead for car mount shooting. Max. Payload Capacity: 48.5lbs (22kg). Weight: 0.6lbs. Includes a pad protector. Can be used at temperatures from 10.4°F - 120°F (-12°C - 49°C).