Review on Ultimate Strength and Durability: Aobbmok Solid Steel Plated Collars - Unmatched Performance for Serious Lifters by Brian Olson

I had a garden trailer with lazy wheels. It came with a 3/4" axle. Standard wheels use a 5/8" axle. I replaced the axle and wheels with the standard 5/8. Instead of trying to drill through a hardened steel axle for a cotter pin, I used these rings. They slide on the axle and lock the wheels. They were so good my neighbor did the same on his trailer.