PF 115 L2 -25-P2-S2 gearbox, the output shaft diameter is 24mm. It is used for 130mm stepper motor, input diameter is 24mm.Gearbox DrawingGearbox Output TypeGearbox Performance ParametersProduct type: Precision planetary gearboxSeries: PF seriesModel: PF 115 L2 -25-P2-S2For 130mm stepper motorOutput shaft diameter: 24mmInput diameter: 24mm