The Micro Gear Motors by Stainless Steel Chain Ever-power provides hobbyists and robotics enthusiasts with an inexpensive solution with their motor needs. The micro gear electric motor is capable of supplying up to 1650g. cm of torque; with such a little size, these fantastic little motors hold their personal against complicated and demanding tasks. Have 
a look under the specifications tab to learn more on purchasing and torque/rpm figures.
Also available is the MB7 Bracket, which is featured in another of the product images and can make mounting the apparatus motor a simple task, requiring just two screws to add the assembly on your own application.
All the micro steel gearmotors have the same physical measurements, so one version can be very easily swapped for another if your design requirements change.
Long (9mm), 3 mm-diameter D-shaped steel output shaft.
4.5mm long, 1mm diameter back shaft, ideal for optical encoders!