Ventev's Interior Rail Stiffeners are for Ventev's 24 x 24 x 10 polycarbonate enclosures. Four rails come in one set and mounting screws are provided. For use as extras or replacements._x000D_  _x000D_  Every Ventev Interior Rail Stiffener is covered by the company's 1-year TerraNet warranty._x000D_  _x000D_  For questions or to order, contact a Ventev regional sales executive at 800.851.4965, or sales@ventev.com