48”Aluminum Extrusion Profile Black 4040 T-Slot, European Standard Anodized Linear Bar Rail Framing 1220 mm for 3D Printer Parts, CNC Routers (4 Pack)

It’s perfectly good profile extrusion. Acceptable price, good measurements. It works as intended.

Good quality extrusions for home project. Reasonable price. 4 sides are taped, so no scratches. 4 of them packaged together nicely.

They are exactly as advertised.

This 4-pack of 4040 extruded aluminum arrived quickly and well-packed. All of the sections were 600mm and had clean cuts. No jagged cuts. Each piece was individually wrapped to protect the surface finish, and the 4 sections were affixed to one another by two pieces of tape in order to prevent the pieces from scratching each other. I'm very happy with these items and the care that was taken to deliver them to me. I plan to purchase more 4040 items from the seller in the months ahead.

These are standard "Light" profile 4040 extrusions. The sections are thin with a low total weight per inch. I would not use these for heavy load applications. That said they appear to be accurate and smooth and straight. Unlike the photos the ends are not anodized but are raw from a saw cut. So you may need to deburr these before using. Fine utility parts for light-duty work such as windows or machine enclosures. I intend to use these for a small robot enclosure with plastic windows. Recommended.

These extrusions are essential for any sort of jig building or sisters where you need to affix things to a rigid frame. These 4040 are straight, strong, and work with T-slot hardware as expected. Value at the time I ordered was also good compared to other sources.

These 4040 T-slot extrusions with a single slot per side can provide strong frameworks. The set I received had accurate dimensions and were 2 mm thick on the main webbing with a central hole of about ¼”. The ends were not anodized, and were clean and square. They were completely covered with the usual protective tape and there was no damage on any of the pieces. Each extrusion weighed 664 - 666g. The anodizing is a dull black, not shiny, and did seem a little thin in places to me with a few very minor imperfections in the finish. However, overall they appear to be fine both cosmetically and structurally. These are very good extrusions at a good price.

Nice build. These extrusions are robust and well manufactured. I'm extending out a platform on our campervan and these are sturdy enough to support several hundred pounds on the platform. No sharp edges. Good overall finish to the aluminum.