1. The axle made by high strength chrome, bend proof, can support more than 220kg. 2. The sprocket can be changed to other type, just make sure the dimension same as this 420 chain sprocket. 3. The axle is symmetric, so the position of the brake and sprocket can be exchanged. 4. Perfect for vertical or horizontal engines with any displacement and electric motors. 5. Fits 6"-10" wheels with 78mm distance from bolt distance 6. It has almost all the rear-end parts you need. Come with: 1x Axle 1x 420 chain sprocket 1x 420 Chain 1x Brake Disc 2x Pillow block bearings 2x 4 bolt pattern wheel hubs 1x Brake Caliper master cylinder 1x 125cc semi auto engine 1x full wire harness