I replaced the trem block in a Squier Classic Vibe 60s Stratocaster with a Musiclilly solid Brass block (which btw is an excellent and very high quality piece of metal that is a huge improvement over the original, I highly recommended it). This arm is the correct diameter for the new Musiclilly brass bridge block's 5.8mm trem arm hole. It is way less loose than the original trem arm which was probably no longer a correct fit and that is why I bought this one. Vastly improved the feel using the trem.And it is also longer, which I really like. It has definitely improved the feel of playing this guitar. It seems to be a sold piece of stainless steel and not a chromed alloy. Very nice, I am glad I got this one.