Review on 🚲 Upgraded Bike Trailer Coupler Hitch Connector: Efficient Attachment for Baby, Pet & More! [Rear Rack Accessories] by Mirzet Gosselin

The black metal piece that bolts to the axle has no jagged edges in the nut recess to prevent slipping. The black plastic insert did not fit snugly into the gray tube and does not bolt on as shown in the picture making it very difficult to connect and disconnect the trailer. The gray pipe looks like it is 3/4 inch copper pipe and the paint is scratched. Maybe try to find a way to attach the black plastic insert instead of sending it back.