... resistance&hardness 3.high precision 4.good strength 5.excellent sintered gear wheel 1.Good quality raw(alloy,carbon steel) ... strict inspection.2. Specifications We make gear wheel , shaft, gearbox . We make High Precision gear, gear wheel , shaft, gearbox .3. ... Steel, Cast Iron, Aluminum, Copper, Brass and so on.5. Heat Treatment: Hardening and Tempering, High Frequency Quenching, Carburizing ...