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Speed Ratio 20: 1/25: 1/50: 1 Powder Metallurgy Transmission Gear Reducer 57mm Mounting Base Planetary Gearbox, Find Details and Price about 57mm Square Housing 4/5/10/16/20/25/50 Ratio from Speed Ratio 20: 1/25: 1/50: 1 Powder Metallurgy Transmission Gear Reducer 57mm Mounting Base Planetary Gearbox - Anhui High Precision Gear Transmission Co., Ltd.