22mm diameter planetary gearbox 22mm *(22.4~42.55)mm ISO 9001:2008 ... approved ratio:from1/3.3 to 1/4592 Diameter 22mm DC planetary Gear Motor Model No.:ZYM-2222mm *(22.4~42.55)mmISO 9001 ... ,35mm,36mm,37mm,38mm,40mm,42mm,45mm,46mm,48mm,65mm Planetary gear motor we have:16mm,22mm,25mm,36mm,45mm 22mm ...