High torque that can be purchased.

[Johnny]

Fisher Price motor + fisher price transmission = 123:1 reduction
Combination of sprockets and shaft i.e 60tooth-10tooth on rotating shaft, 36tooth - 12 tooth on intermediate shaft = 18:1 reduction on two shafts

Overall reduction is 2214:1

Now some estimating:
FP motor free spin rpm= about 20770 rpm
w/ reduction 20770/2214= about 9.38 rpm or .156 rps or 56.29 degrees per second

stall torque of FP motor is .5324 newton*meters
so .5324n*m * 2214(final reduction) = 1178.73 newton*meters or 869.39 foot*pounds of torque. Now depending on how many feet your arm is, you divide that by the estimated foot pounds. So if your arm is 5 feet long, you can lift something at the end of your arm that is about 173 pounds.

This kind of setup is a very nice way to lift anything with an arm and is very reliable, has lots of torque and speed. Teams like 330 have used similar setups and i'm sure you can find more examples. Sanddrag already mentioned this.