... head gearbox Outline dimension:40,60,80,120,160mm Ratio:3-512 Noise:<65dB(A) customized products 4: 1 ratio 60mm motor gear ... mounting position;easy motor mounting;life time lubrication;Figure diameters 40,60,80,120,160mm.more options.Planetary gearbox:PLE:Precision ... Chinese standard of micro motorOur Certification:Our factory: 4: 1 ratio 60mm motor gear head gearbox