High-Quality Material: The tunnel clip is made of high-quality ABS material. The clips provide long-term service and will not rust or crack. They function well in both high and low temperatures. Size: The greenhouse clip is a connector type: 19 mm. Pipe outer diameter: 19 mm - 20 mm. Wide Application: These greenhouse clips are used to attach tarps, shade cloths, greenhouse films, or netting to pipes. They are also an ideal choice for building greenhouses, floor coverings, or other applications as needed. Perfect Fit: The greenhouse clips do an excellent job of securely holding the netting in place. They prevent your greenhouse film from being blown away by the wind. Easy to Clip: This greenhouse netting is easy to clip on. Save time and energy. The frame's shade bar clip is rustproof and difficult to crack. Smooth finish and very durable.