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Package list: 2 pieces right helical gear 1 m 20 teth Material: 45# steel Tooth surface treatment: high frequency quenching Net angle: 90 degrees Note: There are errors due to manual measurement, the size is for reference only. › See more product details; Product description Package list: 2 pieces right helical gear 1 m 20 teth. Material: 45# steel. Tooth surface treatment: high frequency quenching Net angle: 90 degrees. Note: There are errors due to manual measurement, the size is for reference only.; Product description Package list: 2 pieces right helical gear 1 m 20 teth. Material: 45# steel. Tooth surface treatment: high frequency quenching Net angle: 90 degrees. Note: There are errors due to manual measurement, the size is for reference only.; Package list: 2 pieces right helical gear 1 m 20 teth. Material: 45# steel. Tooth surface treatment: high frequency quenching Net angle: 90 degrees. Note: There are errors due to manual measurement, the size is for reference only.