Cheap And Discounts Helical Gear Planetary Gearbox 3Arcmin High Precision Ratio 3:1~100:1 Planetary Reducer 11/14mm Input for Stepper Servo Motor Wholesale. Buy Directly From Merchant Shop1103850686 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.