This is for the 57mm rolling mill (KD-Y5255). Pros: 1) It has a 4:1 gear reduction which is better than what vevor say in their specs. I tested it at home by marking the top roller and counting the turns of the crank arm per 1 roller revolution and it's 4:1. This is hugely beneficial and makes rolling much easier 2) it doesn't need a stabiliser bar like other cheaper rolling mills. It's just a better and much sleeker construction 3) The 5.5 mm roller opening is generous as it can fit thick texture plates and larger ingots without needing to forge them down with the hammer first 4) the "elliptical" wire grooves are half round and really useful for ring bands I also have an expensive direct drive rolling mill from a professional brand which is a bit small for rolling out ingots so I brought in the vevor to help with that bottle neck. It's doing a good job. The built quality is obviously not the same but it's perfectly functional if you keep the gears oiled, anneal the metal frequently and reduce the thickness in small increments

I bought this a few months ago, but my son just built me a small portable bench on which to use it. I am learning to be a metalsmith and have enjoyed putting textures on my metals with this. This has completed my workshop and I will use the rolling mill regularly. Great product.