... reduction ratio Compact structure,reliable&quiet performance Good Gear motor encoder 20mm 2500g.cm ZYM-20A()-195-0640 for print lock 1 ... clients requirements.5.Gear motor we have: 12mm,13mm,16mm,20mm,22mm,25mm,28mm,30mm,32mm, 35mm,36mm,37mm,38mm,40mm ... , for more information please contactour sales engineer. Good Gear motor encoder 20mm 2500g.cm ZYM-20A()-195-0640 for print lock