PF 080 L2 -25-P2-S2 gearbox, the output shaft diameter is 19mm. It is used for 80mm and 110mm AC servo motors, input diameter is 19mm.Gearbox DrawingGearbox Output TypeGearbox Performance ParametersProduct: PF 080 L2 -25-P2-S2 gearboxOutput shaft diameter: 19mmInput diameter: 19mmCompatible with: 80mm, 110mm AC servo motors