Description: [Material]: Greenhouse Window Opener is made of quality iron material, which is wear resistant and can be used for a long time. [Greenhouse Aid]: The automatic window opener greenhouse opens and closes automatically by thermal temperature induction. Keep the plants at the optimal growth temperature and prevent overheating or hypothermia of the greenhouse. [Heat sensitive application]: the greenhouse window opener does not require a battery or power supply. The window opener automatically opens and closes the greenhouse window automatically when the temperature. [Universal design]: thanks to its lightweight and practical design, the automatic window opener for greenhouses is easy to assemble and disassemble and can be easily installed in all standard greenhouses and garden sheds. [Application]: Automatic Window Opener Suitable for breeding greenhouses, flower greenhouses, connecting film greenhouses, fruit greenhouses. Specification: Material: Metal Size Chart: 33.5cm/13.19inch Package Includes: 1 Greenhouse Window Opener(Random Color) Note: Please allow slightly errors 1-2cm differences due to manual measurement.