Solid piece of metal. The hole is slightly larger in the middle but nothing a clamp holding it in place can't fix. It is a good weight and priced just right on deal. I would recommend it and would buy again.
2" hole is larger than other Olympic plates and not smooth. What does this mean? The weight will not sit properly on an Olympic bar and it moves/sways. If you want to use collars with the product it will be fine, but compared to other plates, this is poorly made.