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Product description QXSJEDYCH Bevel Gear Parameters Module: 1 model. Number of teeth: 20 teeth. Inner hole: 6mm/8mm Outer diameter: 21 mm. Outer diameter of the step: 16 mm. Tooth length: 7 mm. Total length: 13.2 mm. Mounting screw hole: M4 x 2 mounting screw hole. Material texture: S45C carbon steel. 1 than 1 total bevel gear weight: 0.17 kg. Frame material: aluminium alloy. : The processing, punching and cutting of aluminium alloys can cause scratches and does not affect the use. The product has no fixed mounting holes, the buyer needs to drill and fix it himself, and there is no cover at the top and bottom. This product is a simple model and cannot be used for high-speed operation. It is used in places where no accuracy is required. Please buy it carefully. One and two off forward and reverse gear refers to the rotation of the input shaft. The direction of rotation of the left and right shaft is once forward and once backward.; Product description QXSJEDYCH Bevel Gear Parameters Module: 1 model. Number of teeth: 20 teeth. Inner hole: 6mm/8mm Outer diameter: 21 mm. Outer diameter of the step: 16 mm. Tooth length: 7 mm. Total length: 13.2 mm. Mounting screw hole: M4 x 2 mounting screw hole. Material texture: S45C carbon steel. 1 than 1 total bevel gear weight: 0.17 kg. Frame material: aluminium alloy. : The processing, punching and cutting of aluminium alloys can cause scratches and does not affect the use. The product has no fixed mounting holes, the buyer needs to drill and fix it himself, and there is no cover at the top and bottom. This product is a simple model and cannot be used for high-speed operation. It is used in places where no accuracy is required. Please buy it carefully. One and two off forward and reverse gear refers to the rotation of the input shaft. The direction of rotation of the left and right shaft is once forward and once backward.; QXSJEDYCH Bevel Gear Parameters Module: 1 model. Number of teeth: 20 teeth. Inner hole: 6mm/8mm Outer diameter: 21 mm. Outer diameter of the step: 16 mm. Tooth length: 7 mm. Total length: 13.2 mm. Mounting screw hole: M4 x 2 mounting screw hole. Material texture: S45C carbon steel. 1 than 1 total bevel gear weight: 0.17 kg. Frame material: aluminium alloy. : The processing, punching and cutting of aluminium alloys can cause scratches and does not affect the use. The product has no fixed mounting holes, the buyer needs to drill and fix it himself, and there is no cover at the top and bottom. This product is a simple model and cannot be used for high-speed operation. It is used in places where no accuracy is required. Please buy it carefully. One and two off forward and reverse gear refers to the rotation of the input shaft. The direction of rotation of the left and right shaft is once forward and once backward.