Kupo Pumping Suction Cup offers a temporary solid light mounting solution for smooth, nonporous surfaces. Each Kupo Suction cup comes with 5/8” baby pin ; 3/8’’thread bolt or 3/8’’ thread socket allow to mount small lights; cameras and accessories on windows, mirrors, automobiles, boats and any smooth, nonporous surfaces. Because of excellent rubber material with silicon, it can be used at temperatures from -12 degree to 49 degree C. Red-line indicator is equipped in most suction cups warming any vacuum loss. It’s pumping in any adverse shooting ircumstances.