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17PL020 Nema17. Output = Nema17 with 1/2" Shaft. Input = Nema17 with 5mm Shaft. gear has a 5mm dia. bore (will work with a nema17 motor that has. Planetary Gearhead, 20:1 Ratio. and one gearhead is missing the box (New No Box), but they are all. ).
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