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PG45 Planetary gearbox reducerDia 45mm planetary steel tools reducerthe pinon gear inside gap size : 5mm.Ratio: 3.7to1,5.18to1,14to1,19to1,27to1,50to 1,71to1,100to 1,139to1,189to 1,263to 1,369to1,516 to 1,721to1--- this gear box can match with nema17 stepper dc motor if you wish to tournament other dc motor , pls touch us , and make sure pionin equipment inside hole sizeReducer photo :stepper gearbox reducer sizeplanetary reducer applicationgear field reducer with tubular electric motormotor cataloguespur tools ,ptpr . n20 motor , brushless motor and motor driver , stepper motor and so on in manufacturing facility store .Contact information:email : cathy88085@qq.comwechat : 13265820577whatsAPP:: 13265820577