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Product Description Screen Tight and MINItrack screen is secured to base with screen roller and spline. Spline (B) rolls into spline groove, tightening the screen. Manufacturer recommends using fiberglass screen with the Screen-Tight and MINItrack porch screening systems and 0.175 In. diameter spline x 300 Ft. bulk roll. From the Manufacturer This Screen Tight bulkspline is a rubber gasket that holds the screen into the track of the Screen Tight base. It is 0.175-Inch by 300-Feet in diamater, which is the diameter of spline is used with fiberglass screen wire mesh.