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Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. 3.Made of 45# steel with high wear-resistance, strong and durable. 4.0.5 Modulus, 80 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:Silvery Brand name: BQLZR Modulus:0.5M Teeth:80T Hole Dia:5mm/0.2 Inch Size:41x10x5MM/1.61x0.39x0.2 Inch ( OD x H x ID) Weight:44g Package include: 1x Motor Gear 1x Screw