... light weight, the specific gravity of fiberglass square rods is only 2/3 of aluminum, 1/4 ... square rods are substitute for metal square rods.Fiberglass Square Rods Features○ Light weight, high strength (300MPa~600MPa) ○ Perfect insulation, ... drilling, turning, polishing, tapping, etc.Fiberglass Square Rods Specification Fiberglass Square RodSize mmWxHLength mm4x4Customized lengthLength marking by ...