Heavy Duty Galvanized Steel Perforated Cable Tray with Long Slot Holes Cable Support System for Outdoor/Indoor Project Product descriptions from the supplier Galvanized Steel Material: Corrosion-resistant, ideal for both indoor and outdoor projects. Perforated Design: Enhances air circulation, preventing overheating. Ventilated Trough: Provides durable cable support with long slot holes. Industrial Grade: Suitable for professional use in various applications.