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Features: 1.Each item is qualify checked with a unique Manufacturing Part Number label on the inner package,in order to confirm if it is authentic item sold by our store. 2.Any question,please contact and send us the MPN label information. 3.Made of 45# steel with high wear-resistance, strong and durable. 4.0.5 Modulus, 60 teeth, 5mm hole diameter. 5.Suitable for within 8 hours not heavy load occasions, good accuracy, high concentricity, more use in personal DIY, small machinery, such as small generators. Specifications: Material:45# Steel Color:Silver Brand name: Yibuy Modulus:0.5M Teeth:60T Hole Dia:5mm/0.24 Inch Size: 31x10x5MM/1.61x0.39x0.2 Inch (OD x H x ID) Weight:24g Package include: 1 x Motor Gear