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Specifications: Material: 45# steel Color: black Brand name: CNBTR Size: 37x10x5MM/1.46x0.39x0.2 Inch (outer diameter x Height x inner diameter) Module: 0.5 Teeth:72 Bore: 5mm Weight: 36g Features: 1. Small size DIY part,Good precision and high concentricity. 2. 0.5 module gears fit for under 8h low strenght project, like little machinary, micro-generators. 3. 72 teeth pinion with 5mm bore, fit for 5mm shaft. 4. Motor gears made of 45# steel, wear-resistant. Package Content: The unique MPN label on each inner package, which confirm it passed the quality inspection and it is genuine item sold from our shop. Please offer it to us when you need assistance.