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High Quality Chain Saw Machines Reducer Inch Size Shaft Mounted Gearbox. High Efficiency Gearing: 98% efficiency per stage with computer-designed helical gears and strong alloy materials. Easy Installation Design: Twin tapered output hub allows easy-on, easy-off mounting with precise shaft gripping. Durable Construction: Close grain cast iron housing with excellent vibration dampening and shock resistance. Long Service Life: Case carburized gears and tapered roller bearings ensure long-term reliable operation. Customizable Size: Size customization available within the range of 2-10 inches. 1-Year Warranty: Comprehensive 1-year warranty coverage for after-sales service and peace of mind.