.310 Flat spline is 5/16" wide rubber piece used for screens. Spline is pliable and works easily into the screen frame channel to hold the screen mesh securely. This roll contains approx 1,000 feet
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As the result of a need to replace 12 screen panels damaged by a deer that somehow got into our backyard pool enclosure two weeks ago, I'm using this 5/16" flat spline in conjunction with new Phiferglass screen. While carefully measuring and analyzing the existing screen and spline to ensure an optimal material match, I determined that this was the correct spline to use. Thus far, I've only been able to replace 4 of the damaged screen panels due to rather cool weather, but I couldn't be more pleased with the results despite a bit of a learning curve for this 'newbie'.