Product: This 90-degree right angle transmission reversing gearbox is designed for applications requiring dual output shafts and efficient power transfer. Constructed from durable materials including aluminum alloy and S45C carbon steel, this gearbox is suitable for low-speed operations where high precision is not required. Specifications: Frame Material: Aluminum Alloy Frame Size: 50 x 50 x 25 mm Gear Details: Teeth Number: 20 Inner Hole Size: 6 mm / 8 mm Outer Diameter: 21 mm Step Outer Diameter: 16 mm Tooth Length: 7 mm Total Gear Length: 13.2 mm Fixing Screw Hole: M4 x 2 Material: S45C Carbon Steel Installation Center Distance: 18 mm Weight: Type A: 0.16 kg Type B: 0.17 kg Important Notes: Surface Scratches: Minor surface scratches may occur due to alloy processing, drilling, and cutting. These do not affect the functionality of the gearbox. Installation Requirements: Mounting holes are not pre-drilled. Users must drill and secure the unit as needed. The unit does not include covers on the top or bottom. Usage Limitation: This gearbox is intended for low-speed applications and is not suitable for high-speed or high-precision use.