We search DC gear motor w/ concentric shaft Diameter maxi: 49mm 250 at 450 rpm. Rated torque: 5 - 7 N/m ( 50 - 70 Kg/cm) 12 V DC The length is not important for us. Our application is for european and US market,(for integrate in a gate). Thank's for your answer if you have this model of gear motor in your production.