NMRV030 High Torque Precision Worm Gear Reducer For Nema 23 Stepper Stepping Motor Gearbox Ratio 10:1 20:1 25:1 30:1 40:1 50:1Home Improvement > Hardware17,55 USD (≈ 15,71 €)DisponibileSold by AliExpress WWVai al negozio