Prime-Line P 7709 Screen Retainer Spline, .250-in(1/4-in), 250-ft Roll, Gray Product Description This screen retainer spline is constructed of top quality vinyl that is round in shape. It features a hollow core center, it is serrated on its exterior surface, and it is gray in color. Vinyl screen retainer spline like this one is used to hold fiberglass and aluminum screen material to screen frames of both windows and doors. This retainer spline has an outside diameter of .250 (1/4") and measures 250 feet in length. From the Manufacturer This screen retainer spline is constructed from vinyl. It features a round hollow serrated core. This type of spline is used to hold screen material to window and screen door frames. Features Used for securing various screen types into window screen channels UV stabilized 0.250 in. diameter Gray extruded vinyl 250 ft Hollow core for easy installation USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.