This 16-inch Oregon S57 chain is a perfect fit for my Worx WG303.1 saw and the price here on Amazon was substantially less than the Worx branded replacement chain. I see that Oregon even makes the Worx OEM chain, so that probably explains why it seems almost exactly the same in every detail. It cuts just as well as the OEM chain did when new, so overall, I'm very happy with it. I think it's always a good idea to have a spare saw chain on hand and I find it's simply a lot faster and more convenient to just swap out chains and then sharpen a dull chain with a 5/32" file later, at a more convenient time. With the quick-change feature on the Worx saw, a chain swap and re-tension literally takes maybe 30-seconds from start to finish, even allowing for a few seconds to wipe debris out of the cover plate with a rag before reinstalling it.