Cheap And Discounts 1Pcs 1Modulus Spur Gear 15 Teeth To 18 Teeth Metal Motor Pinion Convex Gear Rack bore 4/5/6/6.35/7/8/10mm Transmission Wholesale. Buy Directly From Merchant GBT-Hardware Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.