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Product Description Screen retaining spline is the “glue” that holds a good screening project together. Pairing the correct spline size and color will ensure your screens go in smoothly and look great. ADFORS offers a wide variety of screen retaining spline to meet the need of any job, large or small. From the Manufacturer Screen retaining spline is serrated hollow core vinyl. Retaining spline is used to hold the screening material in the frame channel. One 25-Feet package provides enough spline to rescreen the two average size windows or one screen door. Diameter size refers to the thickness of the spline. Various diameters are available.