Product Description F37-F157 Parallel Shaft Helical Gear Motors Drive Reduction Bevel Drive Reducer Product Description F series differential gearbox is 1 kind of parallel shaft helical gear reducer , which consist of 2 or 3 stages helical gears (relate to gear ratio) in the same case. The hard tooth surface gear use the high quality alloy steel, … Continue reading China Custom F37-F157 Parallel Shaft Helical Gear Motors Drive Reduction Differential Bevel Gear Box with Good quality