Geared Motor SM2-Geared-Motor Gear Box : Reduction Ratio 81:1 Output Shaft Dia. 6 mm A/C Flat 0.8D, Length 13.5 mm With Needle Roller Bearing Motor Cap Dia. 40 mm Gear Box Dia. 38 mm, Length - 45 mm (with bearing) Output Torque 2 kgcm at 60 RPM With Motor : 12 V DC ( Tape Recorder) MABUCHI MOTOR Motor Dia. 33 mm, Length - 21 mm Total length of geearbox+motor