Our greenhouse ventilation pulleys are specifically designed to be durable and . They are made with high-class materials that provide a smooth and stable operation, ensuring that your greenhouse ventilation system will function properly for years to come. With our pulley system, you can easily adjust airflow to maintain a comfortable environment for your plants, and the thickened pulley design enables better load-bearing ability. Features -Color:Red -Material:Iron and plastic -Size:10.00X4.60X1.80cm/3.93X1.81X0.71in -The simple and efficient operation of our pulley system saves in maintaining the proper airflow. -With our pulley system, you can easily adjust ventilation to accommodate any weather conditions or plant needs. -The smooth operation of our pulleys prevents damage to the ventilation openings and other greenhouse accessories. -The reliable operation of our pulleys ensures constant airflow within , promoting a healthy growing environment for plants. -Our pulleys are specifically designed for greenhouse ventilation, offering features that standard pulleys do not provide. Package list: 4 x Pulleys