This Vevor 2040 T-slot aluminum extrusion linear rail set includes five 47.24-inch rails designed for DIY builds, CNC machines, laser engraving setups, and 3D printer projects. Made from 6063-T5 aluminum alloy with an anodized finish, the rails are built for corrosion resistance and long-term durability. Precision cutting helps provide smooth, burr-free surfaces for easier assembly and operation. The side groove design is compatible with M4, M5, and M6 T-slot nuts for flexible customization. Lightweight construction makes the rails easy to handle while supporting a wide range of structural applications.