Quote:
Originally Posted by lcoreyl
you probably just purchased 20-2020 (metric) series t-slot from 80/20.
I don't know what the one on the right is, but it looks a little different than 1010 (standard) series t-slot from 80/20, you might need to investigate where your previous t-slot came from?

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Based on their photo, it's more like that they have 25mm 80/20 extrusion:
http://www.mscdirect.com/product/det...S_010=01547645
1 inch = 25.4mm, so that would likely explain a ~0.5mm measured difference.