BAZHOU Greenhouse Window Opener Automatic Vent Accessory Controlled Adjustable with Rod Heavy Duty Garden Tools Garden Tool Rack Greenhouse Automatic Window Opener can prevent wind gusts and be clamped on the greenhouse without drilling holes About our Greenhouse Window Opener, the temperature changes automatically to maintain the optimal growth temperature and prevent the greenhouse from overheating The automatic vent opener is suitable for most current garden greenhouses Auto Greenhouse Window Opener is made of quality aluminum alloy. Durable and rust-proof in humid environments, with long service life Greenhouse Accessory is Easy to install and can be screwed directly into polycarbonate board, wood or metal frame Color: black silver Size: about 33.5cm long Quantity: 1pc 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding. 3. Only the above package contents, excluding other products.