20 Series T-Slotted Aluminum Extrusion with Six Open T-Slots Compatible with all 20 Series Fasteners and Accessories Six open available T-slots for mounting accessories Great for machine guards, sound enclosures, work benches, panel mount racks, displays, 3D CNC framing, 3D Printing framing, or any project that requires a clean, aesthetic look Made out of 6105-T5 aluminum (or equivalent) with a clear anodized finish