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