... precision on gear and gear shaft.3:Small volume with big torque. Maintenance:1:After 300-hours operation, please change the oil, and ... oil and synthetic oil. Specification: Type:Worm Gear ReducerModel:Center Distance:25,30,40,50, ... ,7.5,10,15,20,25,30,40,50,60,80,100Color:Blue/Silver WhiteMaterial ... Gear- Cooper-10-3Worm-20CrMnTi with carburizing and quenching, surface hardness is 56-62HRCShaft-chromium ...