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Specifications Model: 0.5 Mod 20 Teeth Name: Spur Gear Material: 45# Carbon Steel Surface treatment: Black Oxide (Hardened) Other: Cylindrical gears, External gears, Spur Gear Pitch: 1.57mm (0.5 Mod) Bore Diameter: 5mm / 6mm / 6.35mm Number of Teeth: 20T Effective Teeth Height: 6mm Total Height: 10mm Outer Diameter: 11mm Fixed Set Screw: M3 x 2pcs Features The material is wonderful 45# steel. Gear surface high frequency blackening Surface blackening can effectively avoid rust phenomenon and forestall oxidation. 0.5 module gears should be used with 0.5 rack. Notes The size is measured manually, there is a slight error, please prevail in kind. Due to monitor error, the image and the actual shade have a slight error, and do not impact the best quality of the product. There are different sizes in the store, material assorted high quality products, if there isn't any size you need, please contact visitor service, we are able to be happy to help. Package Include According on your Choice. (Click the drop-down menu to select the size, and then select the quantity)