300 Flat Spline - Large Box - 1,000 ft Roll

Introducing our .300 Flat Spline in a large box, containing approximately 1,000 feet of durable, black vinyl spline—perfect for bigger projects! Designed to hold aluminum and fiberglass screens securely in frames with shallow grooves, this flat spline is ideal for screening patios, porches, lanais, and other large outdoor enclosures. Whether you're a professional contractor or tackling a DIY project, the .300 Flat Spline ensures a snug, reliable fit to keep your screens in place for the long haul. With 1,000 feet of spline, you’ll have plenty to cover even the largest jobs!