They are good for a 2020 T slot but the picture they show is a chart, inaccurate. If you're interested, use this with a bearing pulley. for a 3D printer (the schematic is a horrible misrepresentation. I've already removed the ribbon from them so I won't be returning it, but basing your purchase on the schematic will not give you accurate information. If you have a Tslot 2020 this is a good price if you are planning to use them with pulleys that are used with 3D printers then you will be disappointed they do not have slanted pulley slots they are standard t2020 no pulley guides product.
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