Precision Straight Bevel Gear, Transmission Gear, Pinion, Motor Gear, Cogwheel, Umbrella Toothed Wheel, made of Nylon Plastic, Blue. For Example：. Module 1, Module 1.5, Module 2, Gear Ratio 1:2, 90 Degree Right Angle Drive, Number of teeth 15/18/20/30/36/40, Bore 5mm - 25mm.
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