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Planetary ball bearing gearbox for S-400 standard and S-400 long can motors.Comes with pinion for your motor with 2.3mm shaft. Output shaft diameter is 4mm. These gearbox's are very very smooth and quiet unlike other very similar looking units. Also works with brushless motors which have holes drilled to mount S-400 gearbox's such as the Chili Peppers, Himax 2015 and 2025 series motors. If you have a 20mm inrunner, it should bolt to this gearbox. Included pinion is for 2.3mm shaft only.
Size:
OD of mounting flange: 1.08" (27.5mm) OD of main gearbox body 1.165" (29.6mm) Motor Mount Holes: 2 each 2.8mm (.109") 16mm on center Length of gearbox housing 1.25" (31.9mm) Overall Length W/Shaft 1.865 (52.2mm)
 "Planetary Gearbox 3.8:1 #400")