3mm U Plastic Beams, Model Building Supply, 5-Pack

These 3 mm U-shaped plastic beams bring clean geometry and repeatable structure to model building work that calls for narrow channel sections. The pack contains 5 matching white beams, making it easier to plan parallel runs, mirrored layouts or multiple support points within the same build. The U-profile gives each beam an open groove that can be used where parts need to sit in line, slide into position or follow a defined edge. That shape suits scratch-building tasks such as framing, guides, rails and custom supports, while the white finish provides a neutral base for visible sections or later painting. The slim format also helps when space is limited and a full solid strip would take up too much room. Used as trim, reinforcement or a construction connector, each beam adds a crisp, technical look to detailed assemblies. On workshop tables, diorama projects and custom model modifications, these beams support accurate, repeatable placement across small-scale structures. The 5-piece set also leaves room for test fitting, matched left and right sections or extending the same profile through several areas of a build.