5 mm (For hot-dip galvanized materials, the thickness must be at least 1. ) Lenght: 2400 - 2500 mm (The length of the cable tray depends on each different material. Fiberglass cable trays are lightweight, strong, corrosion-resistant, and faster to install than traditional metal options. Beyond initial installation, they also deliver significant savings over the system's lifetime through reduced maintenance needs. We, one of the top Electrical Cable Tray Manufacturers in Vietnam, offer a wide variety of cable trays in various materials (galvanized steel, stainless. Thickness: 1.