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Durability: Brass construction gear with 0.5 module and 78 teeth for performance. Dimensions: Step diameter 15mm, teeth diameter 40mm, total thickness 10mm for precise fit. Compatibility: Offers multiple bores from 2mm to 12.7mm to suit different shaft requirements. Performance: Tightly interlocked teeth ensure stable gear engagement and load-bearing capability. Finish: Machined shaft hole enables smooth installation with minimal roughness and reduced noise.