Description Upgrade your greenhouse ventilation with our manual hand crank winch, designed for effective film rolling and optimal airflow control. This durable greenhouse film hand crank ensures easy operation, precise film tension, and the adaptability to various agricultural greenhouse structures, promoting a balanced growth environment for your plants. Features -Color:Multi -Material:Plastic + Steel + Aluminum Alloy - Size: 19.00X15.00X2.00cm/7.47X5.89X0.79in - Size: 9.00X8.00X6.00cm/3.54X3.14X2.36in -Effortless ventilation control: equipped with a greenhouse hand crank handle, this manual hand crank winch allows easy adjustment of greenhouse film, optimizing airflow for healthier plant growth and consistent crop yields -Durable construction: crafted from antiweathering materials, the greenhouse film roll up handle resists corrosion and wear, ensuring longevity and reducing downtime from frequent replacements in agricultural environments -Accurate film winding: the manual greenhouse film winder precisely rolls film up or down, balancing airtight sealing and ventilation, enhancing the greenhouse microclimate for various horticultural requirements -Universal compatibility: with flexible installation, this greenhouse crank mechanism fits diverse greenhouse film winding equipment, horticultural film winder handle, and film roll up hand crank setups for broad agriculture applications -Easy maintenance: the hand crank handle accessory features a simple cleaning process and reliable design, serving as an ideal replacement winch handle and crank handle repair tool to keep greenhouse garden tools operating efficientlyPackage list: 2 x greenhouse film roll accessories