250mm T Slot 20x20 Aluminum Extrusion European Standard Silver Extruded Aluminum Anodized Linear Rail High Strength Guide Frame for 3D Printer Parts and CNC DIY Workbench(4 PCS 9.85Inch)

These are drop-in replacements to extend the working size of a little CNC machine I made, and they're great. No caveats, they just work, good bars.

You get what is advertised.Useful in making your own hobby shop equipmentStrong material, standard channel size so easy to find parts.

The quality of these bars is completely fine. They measure correct based on the ad, and work great with my 3d printing project. The reason I'm only giving 4 stars is because most of them have scuffs, and there's also a bunch of burrs on the ends, and the metal shavings were included in the packaging. I had to do some cleanup to remove the burs and shavings, which was fine. But the scuffs aren't coming off. At the end of the day, they function just fine. I'd buy these again for the right project.

I ordered these 500mm rails for my husband to expand his 3D printing capabilities. We were happy when they arrived nicely packaged to withstand the shipping process; all of the rails were nice and straight with no dents. They seem durable, and my husband was able to seamlessly integrate them with his Creality printer.He is happy with the quality and construction of these frame parts, and we would order from this company again.

All appear to be straight. Been using for a few months now, have not encountered any issues. Good value.

I find no flaws in the sample I received amongst the four rails. No nicks or oxidizing on the surfaces, the channels are straight and clear. No burrs on the ends. They have the proper dimensions and take the standard t-nuts and brackets I have on hand. I feel like you either get this right, or you don't. Which to me is pretty much: one star? or Five star? Well, this stuff shipped to me promptly, came well packaged and is 'perfect.' So, not much room for nuance. 5 stars. All that's left is price, and that varies over time. Right now this particular brand is on a great Prime Day price... So ultimately, when shopping on price, if this amount of rails and length is amongst the best value at the time you are purchasing, I feel you can shop with confidence by choosing this one. Best luck.~Cheers!

The media could not be loaded.  I picked up this 4-pack of 2020 aluminum extrusion from Apragaz. I'm hoping to try to build my own 3D printer soon and I thought these 500mm long parts would work well for a frame. The T-slot extrusion is what most of my printers have, so I have plenty of M3 T-nuts that will work with these.They came wrapped with plastic adhesive on all 4 sides, though there was a lot of aluminum pieces that were clinging to the inside of that plastic covering. It would have been nice had these been better cleaned before being wrapped. There was no bubble wrapping or any other outer protection. Thankfully mine arrived okay. They look good and measured to be what I expected.These seem to be reasonably priced for a long 4-pack of 2020. It's a shame they weren't cleaned up better before packaging, but they should work fine.

Not the cleanest extruded aluminum I've received, with some metal chips clinging to the plastic film wrapping, and looks like one of the corners may have taken a hit or two during the shipping since the four pieces shipped in a zippered plastic bag. Once unpacked and the film removed the T Slot extruded aluminum is what you'd expect. Not much in tool marking or scratches, the chips peel off with the plastic film. I didn't see any bend in the 500mm pieces and dimensionally it is what is listed. 500mm long (based on a tape measure read) and 20mm x 20mm T-Shot profile.