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Need to know before buying: The equipment is made from 45# steel, and the surface of the tools has been handled with high-frequency blackening! If it will get wet, there could also be rust, which is purely normal, not a quality problem, and doesn't impact typical use! If necessary, please touch visitor service. Product Description: Name:Spur Gear 1.5 ModuleNumber of teeth: 30 teeth-80 enamel Specification: Eg. 30Tx8mm (number of tooth x gap diameter). Outer diameter: 48mm-123mmInner hole:8-25mm.Total thickness: about 20mmTop wire: 2 fixing screw holes M5Surface: high-frequency blackening The records is for reference only, please discuss with the actual product! Package Include: According on your Choose !