Kupo suction cups offer a temporary and solid mounting solution for small lights, cameras, or accessories on smooth nonporous surfaces. Made with durable rubber material with silicone, these suction cups can withstand temperatures ranging from -12°C to 49°C (10°F to 120°F) and are great for use on windows, mirrors, automobiles, boats, and any other smooth nonporous surfaces. It features a red-line indicator to warn of any vacuum loss during adverse shooting conditions, ensuring your equipment stays securely mounted. This 6" (15.24cm) pumping suction cup comes with a 3/8"-16 thread x 5/8" length stud for use withball head camera mounts. (supplied with pad protector) max. Loading: 70lbs(32kg )weight: 1 lbs. (0.45kg)