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Small Model Steel Helical Gear Helical Rack Gear Worm And Pinion Gears Inclined Rack Module 0.5, 0.8, 1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6 Teeth Quantity 10-150 teeth or customized Number of Starts 1, 2 ...