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RustyStefone you don't need a measurement chart, it's pretty simple, 2020 extrusion means 20mm X 20mm, the lengths can be any measurement depending on sellers options. The Slot types depict the actual usage and what it can be used for, V Slot is mainly for wheels and bearing to sit inside for motion whereas you also have T slot which you mainly use for structural and framing using t nuts. V Slot normally only comes in 2020, 2040, 2060 and 2080 sizes, the overall length can be any measurement
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