MOICEYHFelectronic starter DrivesThis worm gearbox is designed for Nema 23 Stepper electronic starter or other 57mmx57mm size electronic starter, the output shaft is offset by 90 from the drive shaft. The advantage for this gearbox is efficiency and self-locking. Besides big cases, no gap structure of box means a maintenance- free that is hermetically sealed. It prevents the lubricant from easily losing and going bad, and exchanging.1*NMRV30 Worm Gearbox1* 102mm Single Output ShaftManufacturer Part Number: NMRV30Gearbox Type: Worm GearboxOutput Type: Hollow BoreOutput Bore Diameter: 14mmInput Shaft Type: Key wayInput Shaft Diameter: 9mmInput Shaft Max. Length: 25mm