Features: The aluminum extruded 2020 T-Slot rods are ideal for DIY applications, such as building 3D printers and other projects. These high-quality 2020 extruded rods offer an excellent solution for custom machine frames, workbenches, prototypes, guards, and many other uses. The extrusion material is excellent for frame construction as it is adjustable and can hold T-Slot Nuts on all 4 sides with grooves.