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Powder Metallurgy Gear Reducers NEMA17 42mm Round Housing Planetary Speed Gearbox, Find Details and Price about 42mm Round Housing 4/5/10/16/20/25/50/100 Ratio from Powder Metallurgy Gear Reducers NEMA17 42mm Round Housing Planetary Speed Gearbox - Anhui High Precision Gear Transmission Co., Ltd.